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Richard Paul Russell Limited
Kestrel 3550FW Fire Weather Meter with LiNK Kestrel 3550FW Fire Weather Meter with LiNK Kestrel 3550FW Fire Weather Meter with LiNK
5-Year Warranty on all Kestrels

Kestrel 3550FW Fire Weather Meter with LiNK

IN STOCK with FREE UK Standard Delivery


Add Collapsible Tripod with Vane & Mount)

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The new Kestrel 3550FW delivers fire specific measurements including wet bulb and barometric pressure measurements.

The 3550FW includes a digital compass for wind direction and LiNK Bluetooth® wireless connectivity for remote viewing and instantaneous sharing of weather data from a mobile device. You can send detailed weather reports with GPS location via text and email with the free Kestrel App ensuring the best quality data for wildfire management plans.

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Kestrel 3550FW Description

Fighting wildfires and protecting lives, property and communities demands accurate weather monitoring and the ability to quickly share data to maximise fire personnel safety and deploy resources. The Kestrel 3550FW paired with the free Kestrel App combines instantaneous and accurate monitoring and logging of data with the ability to share vital weather information for making the most informed decisions for fire management strategy.

A compact, rugged, waterproof, affordable and simple to use handheld device equipped with data logging functionality and wireless data retrieval for monitoring and reporting, the Kestrel 3550FW can be trusted to deliver accurate environmental data to help deliver fire management and safety plans.

The Kestrel 3550FW delivers accurate measurements of barometric pressure, altitude, dew point, heat stress index, relative humidity, temperature, wind speed and direction, wind chill, temperature and wet bulb readings.

Data can be easily viewed and recorded in real-time on a mobile device with the free Kestrel App.

You can export and send detailed weather reports with GPS location via text or email for vital fire weather data management.

Handheld easy-to-read Probability of Ignition (PIG) and Fine Dead Fuel Moisture (FDFM) reference cards come with every unit.

Mil-SPEC-810G drop tested with an IP67 waterproof rating the Kestrel 3550FW is designed and constructed to withstand the harsh working environment it will encounter. The unit comes with a five-year warranty and certificate of conformity as standard.

Kestrel 3500FW Measures

• Altitude (Barometric)
• Barometric Pressure
• Dew Point Temperature
• Heat Stress Index
• Pressure Trend
• Relative Humidity
• Temperature
• Wet Bulb Temperature (Psychrometric)
• Wind Chill
• Wind Speed/Air Speed
• Wind Direction

Kestrel 3500FW Features

• Simple 3-Button Control
• High Contrast, Sunlight Readable Monochrome LCD Display
• Green Backlight
• FREE Kestrel LiNK Software for iOS and Android
• Minimum/Maximum/Average Reading
• Standard user replaceable CR2032 Coin Cell Battery (Average Life 300 Hours)
• Data Hold Function
• Digital Compass
• Date & Time
• Pressure Sensor
• Relative Humidity Sensor
• Temperature Sensor (Patented External Isolated)
• Field Humidity Calibration/Correction Routine
• Kestrel Waterproof PIG (Probability of Ignition) Reference Card Included
• Drop-Tested to MIL-STD-810G
• Neck Lanyard
• Patented Impeller and Sensor Technology (user-replaceable)
• Slip-On/Off Protective Cover
• Waterproof to IP67 (1m for 30 minutes) and Floats
• Certificate of Conformity
• 5 Year Warranty

Primary Measurement Units Resolution Accuracy
(if less)
Wind Speed
or Air Velocity
m/s 0.1 Larger of 3% of reading, least significant digit or 20 ft/min 0.6 to 60.0 m/s
0.6 to 40.0 m/s
1 inch diameter impeller with precision axle and low-friction Zytel® bearings.
Start-up speed stated as lower limit, readings may be taken down to 0.4 m/s | 79 ft/min | 1.5 km/h | .9 mph | .8 kt after impeller start-up.
Off-axis accuracy -1% @ 5° off-axis; -2% @ 10°; -3% @ 15°.
Calibration drift < 1% after 100 hours use at 16 MPH | 7 m/s.
Replacement impeller (NK PN-0801) field installs without tools (US Patent 5,783,753).
ft/min 1 18 to 11,811 ft/min
118 to 7,874 ft/min
km/h 0.1 2.2 to 216.0 km/h
2.2 to 144.0 km/h
mph 0.1 1.3 to 134.2 mph
1.3 to 89.5 mph
knots 0.1 1.2 to 116.6 knots
1.2 to 77.8 knots
Beaufort 1 0 to 12 B
Temperature °F 0.1 1.8 °F -49.0 to 257.0
-20.0 to 158.0
Air, water or snow temperature. Hermetically-sealed, precision thermistor mounted externally and thermally isolated (US Patent 5,939,645) for rapid response. Airflow of 2.2 mph | 1 m/s or greater provides fastest response and reduction of insulation effect. Calibration drift negligible.
°C 0.1 1.0 °C -45.0 to 125.0
-29.0 to 70.0
Relative Humidity %RH 0.1 3.0 %RH 0.0 to 100.0%
5.0 to 95.0% non-condensing
Polymer capacitive humidity sensor mounted in thin-walled chamber external to case for rapid, accurate response (US Patent 6,257,074). To achieve stated accuracy, unit must be permitted to equilibrate to external temperature when exposed to large, rapid temperature changes and be kept out of direct sunlight. Calibration drift +/- 2% over 24 months. RH may be recalibrated at factory or in field using Kestrel Humidity Calibration Kit (NK PN-0802).
Pressure inHg 0.01 typical 0.04 inHg
max 0.07 inHg
0.30 to 32.48 inHg Air pressure at the location. Adjustable reference altitude allows display of station pressure or barometric pressure corrected to MSL. Monolithic silicon piezoresistive pressure sensor with second-order temperature correction. Pressure sensor may be recalibrated at factory or in field. Kestrel 2500 and 3500 display continuously updating three-hour barometric pressure trend indicator: rising rapidly, rising, steady, falling, falling rapidly. Kestrel 4000 series displays pressure trend through graphing function.
hPa (mb) 0.1 typical 1.5 hPa
max 2.5 hPa
300.0 to 1100.0 hPa 10.0 to 1100.0 hPa
Wind Chill °F 0.1 1.8 °F Refer to stated ranges for wind speed and temp. Perceived temperature resulting from combined effect of wind speed and temperature. Calculated based on the NWS Wind Chill Temperature (WCT) Index, revised 2001, with wind speed adjusted by a factor of 1.5 to yield equivalent results to wind speed measured at 10 m above ground. Specification temperature limits established by WCT Tables.
°C 0.1 1.0 °C
Heat Index °F 0.1 3.6 °F Refer to stated ranges for temp. and relative humidity. Perceived temperature resulting from the combined effect of temperature and relative humidity. Calculated based on NWS Heat Index (HI) tables. (Specification temperature limits established by HI tables.)
°C 0.1 2.0 °C
Wet Bulb Temperature (Psychrometric) °F 0.1 3.6 °F Refer to stated ranges for temp., relative humidity and pressure. Temperature indicated by a wet bulb psychrometer under forced aspiration. Calculated from temperature, relative humidity and pressure.
°C 0.1 2.0 °C
Dewpoint °F 0.1 3.6 °F Refer to stated ranges for temp. and relative humidity. Temperature to which the air must be cooled at a constant pressure for water vapour to condense into water. Calculated from temperature and relative humidity.
°C 0.1 2.0 °C
Altitude ft 1 typical 50 ft
max 98 ft
-2,300 to 85,000 ft Height above Mean Sea Level ("MSL"). Temperature compensated pressure (barometric) altimeter requires accurate reference barometric pressure to produce maximum absolute accuracy.
m 1 typical 15 m
max 30 m
-700 to 25,900 m
Max/Avg Wind One-button clear and restart of Max Wind Gust and Average Wind measurement by powering down and restarting unit.
Display & Backlight Reflective 5 digit LCD. Digit height 0.36 in / 9 mm. Choice of aviation green or visible red (NV models only) electroluminescent backlight. Manual activation with auto-off.
Response Time & Display Update All measurements except those based on relative humidity respond accurately within 1 second. Relative humidity and all measurements which include RH in their calculation may require as long as 1 minute to fully equilibrate to a large change in the measurement environment. Display updates every 1 second.
Clock / Calendar Real-time hours:minutes clock.
Operational & Storage Temperature Range The operational temperature range of the liquid crystal display and batteries is 14° F to 131° F / -10 °C to 55 °C. Measurements beyond the operational range can be taken by briefly exposing unit to extreme conditions such that the display and batteries remain within the operational range. Storage range -22 °F to 140 °F / -30 °C to 60 °C.
Auto Shutdown After 45 minutes of no key presses.
Certifications CE certified, RoHS and WEEE compliant. Individually tested to NIST-traceable standards (written certificate of tests available at additional charge).
Battery CR2032, one, included. Average life, 300 hours. Battery life reduced by backlight use in 2000 to 3500 models.
Environmental Waterproof (IP67 and NEMA-6). MIL-STD-810F, Transit Shock, Method 516.5 Procedure IV; unit only; impact may damage replaceable impeller.
Size & Weight 4.8 x 1.9 x 1.1 in / 12.2 x 4.8 x 2.8 cm, 3.6 oz / 102 g (including slip-on cover).
Colour Options Yellow | Olive Drab (NV version)

The manufacturer reserves the right to amend the specification and therefore the information in this document may be subject to change.

Kestrel Case Studies


Crop Spraying

Crop Spraying The safety of crop spraying is reliant on measurements of relative humidity, wind speed and wind direction, these measurements are also critical for maximising the effectiveness of the spraying process. This is also a heavily regulated area with many regions specifying maximum permitted wind speed when spraying to minimise spray drift.

Every single Kestrel model offers fast and certified-accurate wind speed measurements in a unit that fits conveniently into your pocket, making it easy to be in full regulatory compliance. In hot, dry conditions, evaporation can send your expensive chemicals uselessly into the air rather than onto your crops. In these conditions, selecting an appropriate nozzle and increasing the spray droplet size can minimize costly evaporation. Kestrel models are available to measure dry bulb temperature, wet bulb temperature, Delta T, relative humidity and dew point temperature. Every Kestrel humidity measurement uses our patented fast-acting humidity sensor with accuracy guaranteed through a two-point calibration. Wet bulb temperature is pressure-corrected to ensure accuracy even at high altitudes and low humidity.

If your application requires documentation of the weather conditions, use the Kestrel 5000's 2000-point memory to conveniently store all environmental information with the single press of a button, and later upload your stored data to a computer to create a log of spraying conditions (requires optional interface).

Barn Ventilation

Barn Ventilation Environmental control is key to ensure the health of livestock. Effective ventilation and temperature and humidity control of livestock facilities is fundamental and can reduce disease and prevent stock loss, as well as improve your rate of gain and feed-conversion efficiency.

A Kestrel 3000 Pocket Weather Meter allows you to measure the key parameters - air velocity, temperature, and relative humidity and due to its compact size this can be done right next to the livestock and the environment they are experiencing. Complete with an optional rugged carry case that can easily be clipped to your belt, the Kestrel 3000 will always be close at hand to ensure you can complete spot checks efficiently whilst improving your stocks safety and health.


Viticulture Vineyard managers need essential environmental conditions data to maximise the harvest and minimise vine damage. The Kestrel 3000 monitors the key parameters of wind speed, air temperature, relative humidity and dew point right next to the vine. This helps determine the frost protection requirements in the key spring and autumn seasons. If the air is dry (low dew point) heat loss will be greater than when the air is moist, and the threat of a radiation freeze goes up. Dew point and temperature also affect leaf wetness, which influences the development of downy mildew. The Kestrel's wind speed readings ensure that spraying is done safely and effectively during appropriate environmental conditions.

A Kestrel Pocket Weather Meter is also a valuable tool when planning your vineyard. Tracking conditions at potential vine locations can help you develop an accurate understanding of your property's microclimates and select the varietals and growing sites that will ensure success.

Crop Harvesting

Crop Harvesting Choosing the best environmental conditions to harvest crops maximises the harvest and the crop quality. The Kestrel Pocket Weather Meter helps farmers track the current and predicted climatic conditions. Whatever the crop you grow, a Kestrel Pocket Weather Meter (such as the Kestrel 3500) makes it simple to monitor field conditions from your pocket in real-time to pinpoint the ideal conditions for maximising your harvest and crop quality. Rugged, portable and simple to use, it also comes at an affordable price.

Livestock Heat & Cold Monitoring

Livestock Heat & Cold Monitoring Heat stress can cause reduced productivity and even death in livestock. The effects of severe heat stress are often seen in the form of reduced reproductive performance, reduced daily weight gain and reduced milk production. By using a Kestrel to monitor temperature and humidity, and referring to the heat index appropriate for your livestock (indices exist for cattle, swine, turkeys and laying hens), a farmer can take necessary cooling measures in time. Cooling measures include increasing ventilation, making plenty of drinking water available, misting the animals, avoiding transport and movement, and withdrawing feed.

Every Kestrel model, from the Kestrel 3000 and up, includes a heat stress index measurement, ensuring you know when to take appropriate cooling measures in time to prevent sickness and loss.

Wind chill is equally important in the winter. A cow's energy requirements are estimated to increase 1% for each degree the wind chill is below 32°F, and the effect is even more severe for a wet cow. These increased energy requirements have to be made up in additional feed or the animals will fail to thrive.

Every Kestrel model from the Kestrel 2000 and up includes wind chill measurement, letting you know when it is critical to provide additional feed energy and/or wind protection.


Air fields

Air fields Perfect for temporary airfields or remote airfields, FlexiMet Wind and FlexiMet WX systems are fast to install and ensure personnel on the ground can provide needed landing zone weather data. Data logging functionality delivers long term records ideal for analysis prior to developing a remote or temporary airfield.

Recent applications have seen multiple WindSonic sensors at varying heights gathering data via SpaceLogger data loggers determining the variation in wind velocity from ground level upwards.

Other applications include wind and weather analysis for parachute drop zones, local flying clubs and hot air ballooning events.

Aircraft Hanger Door Operating Systems

Aircraft Hanger Door Operating System FlexiWind systems with a WS-15A Display unit have been used extensively to monitor wind speed and direction to ensure safe operation of hangar doors.

Hangar doors often have high wind speed limits and operators must ensure they work within these. The FlexiWind systems with WS-15A displays not only allow for remote viewing and data logging of wind speed and direction data but there is also a single relay switch within the WS-15A display. This allows the hangar doors to be locked down when a defined wind speed limit is met.


Helipads Ideal for harsh remote locations the FlexiMet Wind and FlexiMet WX systems utilise Gill ultrasonic technology guaranteeing accurate data with minimal maintenance. Linked to the IP65 rated WS-15A display, the system is often used as a secondary system, being able to operate locally from a 12V power supply.


Data Buoys

Data Buoys The MetPak Pro sensor allows extra inputs making it ideal for remote environmental data buoy monitoring. The MetPak Pro measures the standard MetPak weather parameters including wind speed, wind direction, air temperature, relative humidity, dew point and barometric pressure. In addition it has the facility for extra inputs to be added enabling sea temperature, precipitation, light readings and depth readings to be acquired.

RPR Ltd can supply the sensor alone or work with the relevant authorities to deliver a complete standalone system. The GBR sailing and canoe teams have both used RPR Ltd's systems for medium to long term monitoring of event locations.

School Weather Stations

School Weather Stations RPR Ltd have been selling weather stations to Schools and other Education establishments for many years. The FlexiMet Wind and FlexiMet WX systems deliver extremely accurate data that is ideal for research purposes. With a power requirement of only 12V, they are quick and easy to install even in remote locations far away from mains power.

The systems will store all the data locally on the SpaceLogger data logger and from here it can be manually transferred to PC using the SD memory card or viewed live on the PC if the system is within a Wi-Fi network. Data is captured and held within a CSV file format making it easy to view within standard Microsoft programs such as Excel.

RPR Ltd can lease, rent or sell the systems depending on the customer requirements.

Emergency Services

Fire-fighting / Emergency Response Vehicles

Fire-fighting / Emergency Response Vehicles To understand air movements and deliver accurate plume modelling it is essential to observe real time environmental conditions.

Richard Paul Russell Ltd have developed a complete weather station utilising WindSonic and MetPak technology that can be fitted to first responders vehicles giving instantaneous weather data within seconds of arrival. The system can be mounted directly onto a vehicle or positioned remotely using a tripod or pole mounting fixed to a structure.

The FlexiMet Wind 1 system using WindSonic technology will deliver wind speed and direction whilst the FlexiMet WX 1 with MetPak technology will monitor additional environmental parameters including temperature, humidity, barometric pressure and dew point. You can add additional functionality to the systems with a bespoke easily mountable display to view instant readings, whilst data logging functionality ensures long term data retrieval for report writing and post event analysis.

Now every first responder vehicle can carry the equipment required to analyse and log the data to ensure the safe deployment of personnel.

Environmental Monitoring

Remote Weather Data Collection

Remote Weather Data Collection SpaceLoggers have been widely deployed for many varied outdoor environmental monitoring applications, including climatic monitoring as well as indoor monitoring within offices, workplaces, warehouses, schools and other premises.

SpaceLoggers are designed to function remotely requiring only 7-30V DC power. The data is stored on an SD memory card so no PC hook-up is required in the field. In the case of the SpaceLogger W8 Wireless data logger, wind speed and direction can be relayed directly to PC over the local Wi-Fi network.

The SpaceLogger S10 is a hugely versatile data logger and may be configured for virtually any sensor outputting RS232 data, including devices requiring polling or handshake to enable data output.

Mapping Conditions & Life on the Sea Bed

Mapping Conditions & Life on the Sea Bed SpaceLogger S10 data loggers have been utilised to map the conditions and life on the ocean floor. SpaceLogger S10 data loggers were being towed at depths of 3000 metres whilst taking recordings of CTD (water conductivity, temperature and depth).

The SpaceLogger S10 data loggers were part of the equipment on three 3000 metre depth rated ‘pods' along with batteries, video processing equipment and control electronics.

Marcus Shirley of Mr ROV, a member of the research team, confirmed back to us:
"The loggers worked great and allowed us to reliably record accurate data which we were able to easily import into our scientific modelling software. The time stamping feature allowed us to sync up all the data with the logged data from the ship's GPS and vehicle USBL position transponder, creating a very comprehensive data set. Many thanks for all your help. The SpaceLogger S10 data loggers were great and 100% reliable, which is very important when you're on a ship far from land!"

Environmental Monitoring

Environmental Monitoring With increased awareness and monitoring of air quality there is a demand for accurate sensing equipment that is reliable, low maintenance and durable. Richard Paul Russell Ltd supply complete weather system solutions that can be easily transported and fixed to structures using a bespoke mounting system or remotely positioned using a tripod.

The Richard Paul Russell Ltd systems use ultrasonic WindSonic and MetPak technology which are pre calibrated and have no moving mechanical parts thus require very little on-going maintenance, reducing operational costs.

Pollution Control

Pollution Control Understanding weather conditions such as wind speed and direction, temperature and humidity is essential when trying to analyse pollution the environmental conditions and deliver plume modelling. Commonly monitoring of pollution and environmental conditions takes place in extremely varied locations, from inner cities to remote rural areas.

The FlexiMet system from Richard Paul Russell Ltd uses the Gill MetPak sensor with an integrated WindSonic ultrasonic wind sensor for high accuracy wind speed and direction measurement combined with air temperature, relative humidity, dew point and barometric pressure readings. When used remotely the system can be powered by battery and solar power with the SpaceLogger W10 data logger acquiring the data into a CSV file for easy download to PC. If the system is held within a Wi-Fi network the SpaceLogger W8 Wireless data logger will allow 'real time' viewing of the data on PC or via the Weather-File website.

The majority of systems we supply are customised and Richard Paul Russell Ltd will work with customers to develop bespoke solutions. Our expert team can advise on a solution that will meet your exact requirements.

Fire-fighting & Emergency Response


Fire-fighting The Kestrel range has been used by fire-fighters and emergency response teams for many years. The Kestrel range has a model that meets all requirements from wildland fire-fighting to search and rescue to hazardous materials response.

Preferred models are the Kestrel 3000 and Kestrel 3500 delivering fire behaviour prediction from wind speed combined with temperature, relative humidity, dew point and wet bulb temperature. This information is key to monitoring heat stress and avoiding heat injury or death of personnel.

Emergency Response

Emergency Response Search and Rescue teams often require additional density altitude with wind readings data to ensure rescue craft and personnel have exact weather conditions ensuring safe operations. The Kestrel 5000 delivers barometric pressure, pressure trend, altitude, humidity, dew point and heat stress readings combined with other parameters in an extremely compact and portable design ensuring quick data retrieval that can be communicated to rescue teams, aircraft and dog team leaders.

HAZMAT teams can rely on the Kestrel 5400 with Bluetooth and portable vane mount as a complete weather kit able to measure all the parameters required for plume modelling whether CAMEO/ALOHA or PEAC. Personnel dressed in heavy protective clothing are safeguarded from the potential effect of heat stress with this variable being specifically measured. Using the Bluetooth data transfer facility all data can be logged and analysed before during and after personnel deployment.

Health & Safety Monitoring

Working at Height

The Health and Safety Executive in their health and safety in roof work paper make specific reference to wind and weather conditions stating that weather conditions should be considered when planning any work at height. Obviously wind, rain, ice or snow can have a direct impact on how secure a foot holding will be.

HSE Advises Maximum Wind Speed

HSE Advises Maximum Wind Speed 1. You should anticipate adverse weather conditions and take suitable precautions. The Work at Height Regulations 2005 specifically require that weather conditions be considered when planning any work at height. Rain, ice or snow can turn a secure footing into a skating rink. A roof should always be inspected before work starts to see if conditions have changed and to check whether it is safe to work.

2. A sudden gust of wind can lead to loss of balance. Roof sheets and, in some circumstances, roofing membrane should not be fixed in windy weather as people can easily be thrown off-balance while carrying a sheet up to or on the roof, particularly when handling large sheeting materials during work on industrial buildings.

3. It is not only in industrial roofing that care must be taken in windy conditions. A slater or tiler cannot work safely in high winds and a roll of roofing membrane can become mobile if it is caught by the wind. On flat roofs, materials such as felts are equally affected and the effect of high wind upon hot bitumen when it is being poured can be extremely dangerous.

4. When deciding whether to continue or suspend work, consider:
  • wind speed
  • the measures that have already been taken to prevent falls from the roof
  • the position and height of the roof and the size of the material being handled

5. A competent contractor should use a hand-held anemometer to measure wind speed if large sheets are being handled.

6. The Beaufort scale (Table 2) gives descriptions of how trees, smoke etc will behave at certain wind speeds.

Laboratory Applications

Laboratory Equipment with RS232 Output

Laboratory Equipment with RS232 Output Much laboratory equipment is supplied with an RS232 output. Where continuous connection to a PC is impractical a SpaceLogger can offer a dedicated data logging solution for short or long term monitoring.

The SpaceLogger S10 is readily configured to record the output from numerous instruments and devices producing time-stamped records in .CSV file format.

SpaceLoggers are commonly used for recording cycle records from autoclave machines. They provide a cost effective and efficient way to monitor equipment with an RS232 output including weighing scales, refrigerators, freezers and storage rooms.

The SpaceLogger T10 model is ideal for balances or analysers with a print command and RS232 output and will keep a text record identical to the paper print-out. This file can be read using Notepad or similar.

Marine, Ships & Harbours

Dockside Cranes

Dockside Cranes Dockside cranes can be exposed to the worst weather conditions and as such are susceptible to wind related damage and potential collapse. Operators need clear and accurate wind data delivered to the cab and monitored remotely to ensure they work within guidelines.

Richard Paul Russell Ltd has developed specific wind systems for crane use. The systems utilise a Gill ultrasonic sensor mounted high on the crane jib / boom. This is then linked to a WS-15A display in the cab that has high and low alarm settings ensuring an audible or visual alarm is activated when the wind speed reaches the maximum allowed.

The wind data is recorded using the SpaceLogger W10 or SpaceLogger W8 Wireless data loggers providing date and time stamped data for operator records. In the case of the SpaceLogger W8 Wireless data logger, wind speed and direction can be relayed directly to a site office PC and viewed live using our WeatherFile website.

The majority of systems we supply are customised and Richard Paul Russell Ltd will work with customers to develop bespoke solutions. Our expert team can advise on a solution that will meet your exact requirements.

Port & Harbour Authorities

Port & Harbour Authorities Richard Paul Russell Ltd has developed a cost effective stand-alone weather station using the Gill MetPak and Gill WindSonic sensor. The station can deliver wind speed and direction via the WindSonic and add air temperature, relative humidity, dew point and barometric pressure with the MetPak sensor.

The environmental data gathered can be viewed local using the WS-15A display or when connected to the SpaceLogger W8 Wireless data logger over the Wi-Fi network on PC with our WeatherFile website.

The system delivers a maintenance free, robust and highly accurate solution for local weather information. Essential data for harbour authorities, visiting ships and recreational water sport participants.


Missile Trajectory Prediction

Missile Trajectory Predictio The RPR Ltd FlexiMet WX systems supply the accurate meteorological data required accurately predict ballistic trajectories within the atmosphere.

A projectile moving through the air is effected by a number of forces including wind, temperature, barometric pressure, and humidity, so accurate monitoring of all weather parameters is essential.


UAV Accurate observation and measurement of surface wind at UAV sites is essential to ensure correct and successful launch and landings. FlexiMet Wind systems allow data to be gathered on site from various locations and analysed.

Because the size and design of UAV's varies greatly, knowing the surface wind conditions is critical to ensure control of the UAV is maintained. Any deviation from the planned flight path can pose a safety risk to ground crew and could result in serious damage to or total loss of the aircraft.

Recently multiple Gill WindSonic sensors have been connected at varying heights with data being monitored via SpaceLogger data loggers giving essential information for post launch and pre landing flight.

Temporary or Remote Air Fields

Temporary or Remote Air Fields Perfect for temporary airfields or remote airfields, FlexiMet Wind and FlexiMet WX systems are fast to install and ensure personnel on the ground can provide needed landing zone weather data. Data logging functionality delivers long term records ideal for analysis prior to developing a remote or temporary airfield.

Recent applications have seen multiple WindSonic sensors at varying heights gathering data via SpaceLogger data loggers determining the variation in wind velocity from ground level upwards.



Athletics Whether an athlete, professional coach or sporting venue the Kestrel 5400 is essential for measuring athletes performance and preventing heat stress. Environmental measurements such as temperature, relative humidity, heat stress index, wet bulb temperature, wet bulb globe temperature (WBGT) and more are essential to ensure safe training and competition conditions.

By using a Kestrel 5400 Heat Stress Tracker, athletes, trainers and coaches can view and record real time environmental data during practices and competition throughout the season. With 2300 storage points, users can wirelessly transfer the information captured to their PC or android phone for future reference via the Bluetooth wireless data option in the Kestrel series.

With the Kestrel 5400 users can set customisable warning screens with six individual thresholds coming as standard with the software. Each threshold can be set to signal a visual warning on the display so users can proactively monitor conditions and keep athletes safe.

Combined with the Kestrel Large Tripod and Vane Mount the Kestrel 5400 can monitor environmental conditions remotely helping to gather valuable data before, during and after an event.

Sailing & Yacht Racing

Sailing & Yacht Racing Whether racing dinghies, keelboats or cruising in blue water, The Kestrel range of weather meters can supplement land based or on board weather information. Understanding the exact wind speed, average wind speed and maximum gusts gives the exact data required to ensure the perfect rig set up and maximise the crafts performance.

The Kestrel 1000 is an extremely cost effective entry level model supplying average wind speed, current wind speed and maximum gust.

The Kestrel 5000 monitors a far wider set of weather parameters including barometric pressure, pressure trend, relative humidity, heat stress index, wind chill and many more. When combined with automatic data storage, this is useful when reviewing rig performance, tracking storm development and deciding future rig settings and clothing requirements. 100% waterproof and durable the Kestrel floats in water minimising the likelihood of loss.

Skiing & Snowboarding

Skiing & Snowboarding Competition skiers, mountain rescue teams, snowmaking personnel, ski patrols and resort managers all require accurate, instant and local weather information. From a competitors decision about what equipment and wax to use, to resort managers determining when and where to use snowmaking equipment.

The Kestrel 5000 and Kestrel 3500 feature an external temperature sensor. Simply place the sensor into the snow pack to gain fast and accurate data wherever you are on the piste. The added functionality of wind speed, wet bulb temperature, relative humidity, wind chill, and barometric pressure provides full weather station data in your hand from anywhere on the resort. Tough, durable and waterproof it will also last.

Hang Gliding, Paragliding & Ballooning

Hang Gliding, Paragliding & Ballooning Powered and unpowered aviation enthusiasts are heavily reliant and influenced by the wind. The Kestrel 1000 delivers extremely accurate current wind speed, average wind speed and maximum gust speed data in your hand from the exact launch location.

The Kestrel 2500 includes altitude, pressure and wind chill data all important when determining flight pattern and clothing requirements.

The Kestrel 5500 increases functionality further by supplying wind direction, crosswind and headwind/tailwind calculations accurately and automatically - valuable data prior to launch. Kestrels start from under £100 come with a 5 year warranty, are extremely waterproof and durable making it an essential piece of kit for all air sports enthusiasts.

Backpacking, Camping, Climbing & Mountaineering

Backpacking, Camping, Climbing & Mountaineering Monitoring and predicting weather in remote areas can be challenging, understanding current and future weather conditions is vital for good preparation and the ongoing safety of any outdoor activity. Carrying a Kestrel Pocket Weather Meter gives the valuable environmental parameters required to make key decisions such as; do I push for the summit, what clothing to take, how large is the weather window, what level of heat stress will I endure.

The Kestrel 5000 delivers all the parameters required including barometric pressure, pressure trend, altitude, relative humidity, heat stress index, dew point, wet bulb temperature, density altitude, wind chill, temperature (air, water and snow), current wind speed, average wind speed, and maximum gust. The Kestrel 5000 has an extensive memory and can log data to be reviewed at PC, sent to base camp or rescue teams. Whatever level your outdoor activity Kestrel will ensure you start fully prepared.

Search & Rescue

Search & Rescue Rescue teams need to quickly and accurately assess the conditions wherever they're working, they need to monitor the local weather conditions, predicted weather conditions and information to assess exposure and heat stress. This information is vital for ground crews and rescue helicopters to deliver fast and save evacuations.

The Kestrel 5000 supplies valuable data including barometric pressure, pressure trend, altitude, relative humidity, heat stress index, dew point, wet bulb temperature, density altitude, wind chill, temperature (air, water and snow), current wind speed, average wind speed, and maximum gust. This data provides the foundation for fast and decisive decision making ensuring the safety and speed of all those involved in a rescue operation.

Kite Surfing & Windsurfing

Kite Surfing & Windsurfing Up to the second accurate wind speed information is what the windsurfer and kitesurfer need to determine sail area and board choice. The Kestrel 1000 for under £100 delivers current wind speed, average wind speed and maximum gust in your hand providing wind information pin point accurate to your location.

The Kestrel 2000 includes temperature (air and water) and wind chill helpful when considering the correct attire and how the conditions will feel on the body. 100% waterproof, held in a durable casing with a patented replaceable impellor the Kestrel won't let you down however hard you play.

Paddling & Kayaking

Paddling & Kayaking Paddling and kayaking enthusiasts are keen to understand wind speed and water temperature. Long distance touring paddlers use this information to decide upon their equipment list, clothing and likely distance to be travelled. The ability to predict changing weather makes long distance trips safer and more enjoyable. The white-water paddler will utilise the water temperature and wind chill information when calculating the amount of clothing required and potential impact on their performance.

The superlight Kestrel 2000 displays current wind speed, average wind speed and maximum gust with air/water temperature and wind chill.

The Kestrel 3500 carries the extra functionality required to predict future weather conditions, monitor relative humidity and heat stress. Both models are fully waterproof, lightweight and durable.


Flying Flying enthusiasts whether private plane, small helicopter, ultralight or glider rely upon accurate weather information when taking off or landing. The Kestrel 5000 delivers key information including wind speed, altitude, barometric pressure and density altitude readings particularly useful when flying to remote or unmanned locations. Each Kestrel is designed with a huge amount of market knowledge and expertise and with one of the Kestrel founders being an avid glider pilot. The Kestrel has unique functionality tailored to flyers' exact needs.

Long Range Target Shooting

Target shooting Competitive shooters understand that crosswind, air pressure, temperature and humidity all impact on the accuracy of their shot. These variables all go towards the ballistic coefficient and wind drift of your shot, historically shooters have used experience and rough estimates to deliver a result often not leading to a small group.

The Kestrel with Horus or Applied Ballistics measures every parameter required including wind speed and direction to calculate crosswind and headwind in relation to the target. This data combined with actual and barometric altitude, density altitude, temperature and relative humidity that can be logged automatically and manually with up to 2000 individual data sets.

The Kestrel Shooter's Weather Meter with ballistics calculator measures wind speed/air velocity, temperature, wind chill, relative humidity, heat stress index, dew point temp, wet bulb temp, barometric pressure, altitude, density altitude, wind direction, crosswind, headwind/tailwind, and pressure trend. This data is supported with a choice of Horus or Applied Ballistics software.

The Horus® database has simple, intuitive screens allowing the user to create up to five targets customized for location, distance, direction, declination and winds. The Kestrel meter's highly accurate measuring and averaging of the wind and digital compass for target bearing and wind direction assists in defining the target winds. Once these parameters are set, the Kestrel meter takes over - tracking the current met data and automatically updating the firing solution using Horus® advanced proprietary algorithms and taking coriolis and spin drift into account. No additional user input is required.

The Applied Ballistics version calculates the accurate fire control solution for long range rifle shooting. By selecting from the super accurate 'Litz' library of G1 or G7 ballistic coefficient that has data for more than 225 long range bullets combined with the 15 environmental parameters at your fingertips you are able to train the software to match your specific rifle based on observed impacts, totally removing the guess work from trajectory calculation.

Both versions also come with an option for integrated Bluetooth technology offering the ultimate in portable and accurate environmental data. Now, both real-time and logged data can be transferred wirelessly and automatically to a laptop or PDA, making a Kestrel the perfect tool for virtually any job that requires quick and reliable data.

Pete Moore from Shooting Sports Magazine reviews the Kestrel 2500NV weather meter

"If accurate shooting is your goal then you need to have all bases covered, consider a wind meter ... "

"... I approach my hunting by ensuring I have all the data and the right items I need to make the shot count every time... a chance to try out a wind meter was a bit of a revelation and now I know what I have been missing.

For me the real revelation was to know the actual wind speed, followed by the ability to get high, low and average readings quickly and apply them to a firing solution. The biggest surprise was how far out my eyeball methods of judging the speed were."

Pete Reckons

• If you take your shooting seriously this is an essential item
• Well made and easy to use
• Good choice of models/functions

In the Press
Download PDF Read the full review of the Kestrel 2500NV weather meter in the Jan 2010 edition of Shooting Sports (PDF 2MB)

Archery Competitive archers rely on their ability to compensate for the wind conditions, as the wind applies pressure on the bow it will determine greatly the arrows flight direction and rate of fall.

A Kestrel 1000 offers a simple and accurate solution providing current wind speed, average wind speed and maximum gust data in a pocket sized device that can be used in hand or fixed to a collapsible compact tripod with a vane mount.

The Kestrel 1000 is the perfect solution whilst practicing to learn how varying wind conditions impact on the arrows flight path and during competition to ensure an archer reads conditions correctly and compensates accordingly


Scientific Research

Scientific Research Academic research, product development, testing and analysis all require a high level of accuracy along with convenient data storage.

SpaceLoggers have been used extensively for projects including sub-sea condition research, wind farm site analysis, pollution and noise monitoring and road traffic analysis, particularly where equipment is remote or space or power at a premium.

The SpaceLogger S10 for example offers a versatile solution to gathering data from numerous devices with RS232 output when it would be impractical to have direct link to PC. The SpaceLogger S10 connects directly to up to two RS232 data inputs, the data is stored on to an SD memory card that can be easily transferred to PC.

The SpaceLogger A10 will take up to 2 4-20mA inputs as well as an RS232 input, converting all to a combined, time-stamped serial data output and .CSV file.

Sport (Windsystems)

Sailing Schools, Clubs, Marinas, Coaching & Race Management

Sailing Schools, Clubs, Marinas, Coaching & Race Management Sailing and Yacht clubs require accurate wind data linked to an in-club display. Richard Paul Russell Ltd has developed a cost effective accurate solution. The FlexiMet Wind 1 system combines ultrasonic WindSonic technology with a tailor made software package that delivers a graphical display of real time and historical wind conditions, including current wind speed, average wind speed, maximum gust and direction straight into the club house. Combine this with MetPak technology and you can supply additional temperature, wind chill, humidity, barometric pressure and dew point measurements.

The systems can be remotely positioned with radio links delivering a constant data feed or by cable depending on distance. If you require a separate display remotely, e.g. your starting hut is positioned away from the club house display, the WS-15A Display provides a compact robust cost effective solution.

All the data can be logged using the SpaceLogger W10 (WindLogger) a compact unit that requires low power it will date and time stamp your data direct onto SD card for later analysis. The SpaceLogger W8 Wireless option will allow live viewing of the data via our WeatherFile website.

Golf Clubs

Golf Clubs Golfers and golf course management take an active interest in the weather conditions. Temperature, Wind speed and direction measurements linked with precipitation readings form the basis of informed decisions regarding when to spray the course or determining the areas that could be susceptible to flooding. All this information can be data logged ensuring useful long term reporting, taking the guess work out of golf course care and management and useful for risk assessment linked to wind speed and direction.

The WeatherFile software delivers a professional display within the clubhouse or over the internet giving golfers real time information, helping them to decide on the correct clothing or when to sneak in that après work round.

Once installed the Richard Paul Russell Ltd system requires virtually no maintenance due to there being no moving parts and unlike a traditional cup and vane wind system it won't stop when a bird lands on it.

Sports Stadium

Sports Stadium Sports stadium management and visitors utilise local weather information for many reasons. Officials will use it to determine whether to cancel events due to weather conditions and facility managers can rely on the weather data to determine heating and cooling plans. Grounds and maintenance crews will utilise the information to determine mowing, planting and watering schedules, and research and educational establishments can incorporate weather station and weather data into their coursework.

The information is invaluable for coaches and athletes to evaluate performance and the impact of environmental conditions on individuals.

Richard Paul Russell Ltd can supply systems that simply monitor trackside wind conditions or develop full weather stations linked to our SpaceLogger W10 or SpaceLogger W8 Wireless data loggers, WS-15A display or WeatherFile website for real time viewing of conditions and long term data gathering for later analysis.

The majority of systems we supply are customised and Richard Paul Russell Ltd will work with customers to develop bespoke solutions. Our expert team can advise on a solution that will meet your exact requirements.

Sport (Data Loggers)

Recording Of Sports Venue, Athlete & Equipment Performance Data

Recording Of Sports Venue, Athlete & Equipment Performance Data Capturing environmental data and analysing it is key to the training and development of athletes and coaches.

SpaceLogger W10 and SpaceLogger W8 Wireless data loggers allow remote capture of weather data in the field, on the water or track-side in the sports stadium. As part of a complete FlexiMet Wind or FlexiMet WX Weather station the SpaceLogger will record all data that can then be transferred either manually to PC using the SD card or viewed in real-time on PC when using the SpaceLogger W8 Wireless data logger.

For monitoring other athlete performance data, a SpaceLogger S10 can be configured for virtually any equipment with RS232 output offering a simple solution to add data logging function to existing or new systems.

SpaceLogger have been deployed at recent Olympic & World Championship venues to provide better understanding of the local conditions to ensure teams have the best information to make critical decisions which may make the difference in achieving a medal.

Weather Monitoring


Weather From the weather enthusiast to the serious weather professional. From those purely interested in monitoring wind speed and direction data to professionals analysing the full spectrum of weather parameters. Richard Paul Russell Ltd supply systems that cater for every area.

The FlexiMet Wind and FlexiMet WX systems are used extensively by research institutions, weather analysts, agriculture professionals, sports associations and bodies, educational establishments, military bodies and weather enthusiasts alike.

Whatever your requirement, Richard Paul Russell Ltd have a system to suit your needs. It could be a simple FlexiMet wind system delivering live wind data to a full FlexiMet WX system with data logging and Wi-Fi connectivity, allowing remote viewing of all weather parameters live over the internet via the Richard Paul Russell Ltd WeatherFile.com website. If it isn't one of our published systems we can work with you to deliver a bespoke solution.