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Richard Paul Russell Limited
Kestrel DROP D2 Heat Stress
5-Year Warranty on all Kestrels

Kestrel DROP D2 Heat Stress Wireless Temperature & Humidity Data Logger
(compatible with iOS & Android)

In Stock with FREE UK Standard Delivery


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An easy to use highly accurate temperature and humidity data logger with free-to-use Bluetooth connected App for both iOS and Android.

 Live chat available. Mon-Fri, 9am till 5pm (GMT)
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on all in-stock models
Free UK Delivery
Free standard delivery
Next day delivery available
Return Policy
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Return within 21 days

Kestrel DROP D2 Heat Stress Description

The Kestrel DROP D2 Heat Stress is an extremely durable and easy to use temperature and humidity data logger, you can access data and chart real-time using the free Kestrel Connect App and download data in .csv format

The DROP D2 HS logger is IP67 rated (30-minute submersion at 1m) and MIL-STD-810G drop tested making it ideal for remote locations, inside or outside. The Kestrel Connect App allows data to be viewed from your connected device up to 100ft away.

Each unit comes complete with a user replaceable CR2032 Coin Cell Battery (average life 300 hours) and is equipped with a sturdy D-ring for hanging wherever needed.

Kestrel DROP D2 Heat Stress Measures

• Temperature (Fahrenheit and Celsius)
• Relative Humidity (RH)
• Dew Point Temperature
• Heat Stress Index

Kestrel DROP D2 Heat Stress Features

• Bluetooth Smart (Wireless Technology)
• Data Logger
• Free Kestrel Connect App
• 24 x 46 mm x 60 mm, weighs 34 grams
• Drop-Tested, MIL-STD-810G
• IP67 Waterproof Waterproof to IP67 (3'/1M for 30 minutes)
• Lightweight & Durable
• CR2032 Coin Cell Battery (average life 300 hours)
• Kestrel Certificate of Conformity
• 5 Year Warranty Manufacturer's Warranty
• LiNK Wireless Communication to Mobile Devices (Bluetooth low energy)
• Floats
• Relative Humidity sensor

Kestrel DROP D2 Heat Stress measures
• Temperature
• Humidity
• Heat Index
• Dew Point Temperature
Units Of Measurement
• °C, °F
• % RH
• 0.5 °C
• 2 %RH
Operational Range
• -30 to +55 °C
• 0 to 100% RH
Specification Range
• -20 to +55 °C
• 10 to 90%RH at 25°C
Kestrel DROP D2 Heat Stress features
• Bluetooth Low Energy (BLE) wireless communication with smart device for real-time viewing of data, data download, graphing, charting and sharing
• Kestrel Connect App available at the iTunes App store & Google Play store
• Share data with the Kestrel Connect App via email, text and social media
• Rugged, drop tested to MIL-STD-810G standard
• Accurate
• Waterproof to IP67 standard
• Available in red, blue and tan
• 5 year warranty



Primary Measurement Units Resolution Accuracy
Specification Range Notes
Ambient Temperature °F 0.1 0.9 °F   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.
Thermistor may also be used to measure temperature of water or snow by submerging thermistor portion into material -- ensure humidity sensor membrane is free of liquid water prior to taking humidity-based measurements after submersion.
°C 0.1 0.5 °C -20 to +55 °C
Relative Humidity %RH 0.1 2 %RH 10 to 90%
Polymer capacitive humidity sensor mounted in thin-walled chamber 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.
Heat Index °F 0.1 TBD °F Refer to stated ranges for temp. and relative humidity. Calculated measurement.
Perceived temperature resulting from the combined effect of temperature and relative humidity. Calculated based on NWS Heat Index (HI) tables. (Measurement range limited by extent of published tables)
°C 0.1 TBD °C
Dew Point °F 0.1 TBD °F 15 to 95 % RH
Refer to stated ranges for temperature sensor
Calculated measurement.
Temperature that a volume of air must be cooled to at constant pressure for the water vapour present to condense into dew and form on a solid surface. Can also be considered to be the water-to-air saturation temperature.
°C 0.1 TBD °C
Bluetooth Data Upload Utilizes Bluetooth Low Energy (BLE) module.
iOS Device needed to receive uploaded data.
iOS Device must be within range to receive data.
(See Getting Started with your Drop for more info.)
Data Storage Configurable within App
Response Time Configurable within App up to 2 seconds.
Operational & Storage Temp Range Operational: -30 °C to +55 °C, 10 TO 1200 hPa, 0 to 100% RH,
some functionality may be limited or disabled at extremes.

Storage: -22.0 °F to 140.0 °F | -30.0 °C to 60.0 °C.
Clock & Calendar Time and Date is automatically updated when connected to phone
Certifications CE certified, RoHS and WEEE compliant. Individually tested to NIST-traceable standards
Battery One CR2032 Battery (included).
The battery life will vary based on usage. For baseline conditions and settings1, the battery will last approximately 6 months.
Battery life will be reduced by:
a) colder conditions
b) more frequent logging rates
c) more frequent update rates
Downloads of large data logs (or firmware updates) are best completed with a fresh battery and in temperatures above 10°C / 50°F.
(1Temperature = 75°F, Logging Rate = 10 minutes, Update Rate = 30 seconds)
Environmental Sealing: Waterproof (IP67 and NEMA-6).
Shock Resistance: MIL-STD-810Fg, Transit Shock, Method 516.5 Procedure IV
Origin Designed and manufactured in the USA from US and imported components. Complies with Regional Value Content and Tariff Code Transformation requirements for NAFTA Preference Criterion B.
Size & Weight 2.4 x 1.8 x 0.9 in / 6 x 4.5 x 2.3 cm, 1.2 oz / 34 g
Colour Options Red | Blue | Tan

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

Accuracy calculated as uncertainty of the measurement derived from statistical analysis considering the combined effects from primary sensor specifications, circuit conversions, and all other sources of error using a coverage factor of k=2, or two standard deviations (2Ε).