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Kestrel DROP D3 Wireless Temperature, Humidity & Pressure Data Logger

Updated:2025-03-13

Brand: Kestrel
Model: DROP D3
Description: The Kestrel DROP D3 is designed to monitor and record a full suite of environmental conditions, including temperature, humidity, heat index, dew point temperature, barometric pressure, density altitud
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Product Details

Kestrel DROP D3 Wireless Temperature, Humidity & Pressure Data Logger Description：

Datasheet User's Manual

The Kestrel DROP D3 is designed to monitor and record a full suite of environmental conditions, including temperature, humidity, heat index, dew point temperature, barometric pressure, density altitude and pressure trend in a variety of indoor, outdoor and industrial applications.

Kestrel DROPs are ideal for monitoring conditions in manufacturing, transportation and shipping, shooting and hunting, facilities management, agriculture, healthcare and pharmaceutical organizations, firefighting, the military field, and recreational and in-home use. Put a DROP virtually anywhere and ensure safe conditions when you can’t be there.

Small, Accurate, Rugged and Waterproof

Each DROP measures just 1 x 1.8 x 2.4 inches (24 x 46 mm x 60 mm) and weighs just 1.2 ounces (34 grams). DROP loggers meet military and international standards for water, dust and shock resistance (IP-67 and MIL-STD-810G) and are conveniently equipped with a sturdy D-ring for hanging wherever needed.

Log, View and Share on the Kestrel LiNK App

Kestrel LiNK is the free app that powers the DROP loggers. With Kestrel LiNK on your smart phone or tablet, you can view real-time readings from any DROP logger within wireless range (up to 100’ or more line of sight) via Bluetooth® low energy. Each phone or tablet can connect to up to 8 DROP loggers at the same time and store data logs from many more. Min/Max/Average readings are clearly displayed and the data log is viewable as a scrolling graph with detailed data for each logged point. The Kestrel LiNK app also allows adjustment of the logging interval and other settings as well as real-time threshold alerts. Readings can be updated as frequently as every 2 seconds and logging time and date are automatically updated whenever connected to your smart device. You can also send and share real-time and logged environmental data via email, Facebook or Twitter

Applications

Long-Range Shooting

Long-range shooters need some of the most precise calculations in the palm of their hands in order to make extremely accurate shots in a variety of environmental conditions. Know the effects of barometric pressure and density altitude on bullet flight.

Aviation

Constantly changing weather conditions make real-time flight decisions crucial for pilots in small aircraft and helicopters. Prevent takeoff and landing accidents by accurately measuring density altitude and adjusting flight operations depending on the area’s high or low density altitude.

Skydiving

Skydivers depend on density altitude to make decisions involving canopy size. Proficient parachutists may select smaller canopy sizes for routine jumps but may actually want to upsize to a larger canopy in high density altitudes. Higher density altitudes may also indicate a faster canopy descent.

FEATURES

Drop-Tested to MIL-STD-810G

Floats

LiNK Wireless Communication to Mobile Devices (Bluetooth low energy)*

Pressure Sensor

Relative Humidity Sensor

Temperature Sensor (Patented External Isolated)

Waterproof to IP67 (3'/1M for 30 minutes)

Specification

SENSORS
SENSORS	ACCURACY (+/-)	RESOLUTION	SPECIFICATION RANGE	NOTES
AmbientTemperature	0.9 °F 0.5 °C	0.1 °F 0.1 °C	14 to 131°F -10 to 55 °C	Airflow of 2.2 mph\|1 m/s or greater provides fastest response and reduction of insolation effect. For greatest accuracy, avoid direct sunlight on the temperature sensor and prolonged sunlight exposure to the unit in low airflow conditions. Calibration drift is negligible for the life of the product. For further details, see Battery Operational Temperature Limits.
Relative Humidity	2%RH	0.1 %RH	10 to 90% 25°C noncondensing	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 is typically less than ±0.25% per year.
Pressure	1.5 hPa\|mbar 0.044 inHg 0.022 PSI	0.1 hPa\|mbar 0.01 inHg 0.01 PSI	25°C/77°F 700-1100 hPa\|mbar 20.67-32.48 inHg 10.15-15.95 PSI	Monolithic silicon piezo-resistive pressure sensor with second-order temperature correction. Between 1100–1600 mbar, unit will operate with reduced accuracy. Sensor may not operate above 1600 mbar and can be damaged above 6,000 mbar or below 10 mbar. Calibration drift is negligible for the life of the product.

CALCULATED MEASUREMENTS
MEASUREMENT	ACCURACY (+/-)	RESOLUTION	SENSORS EMPLOYED
Density Altitude	226 ft 69 m	1 ft 1 m	Temperature, Relative Humidity Pressure
Dew Point	3.4 °F 1.9 °C 15- 95% RH. Refer to Range for Temperature Sensor	0.1 °F 0.1 °C	Temperature, Relative Humidity
Heat Index	7.1°F 4.0°C	0.1 °F 0.1 °C	Temperature, Relative Humidity
THI (NRC)	1.5 °F 0.8 °C	0.1 °F 0.1 °C	Temperature, Relative Humidity
THI (Yousef)	2.3 °F 1.3 °C	0.1 °F 0.1 °C	Temperature, Relative Humidity
Wet Bulb Temperature - Psychrometric	3.2 °F 1.8 °C	0.1 °F 0.1 °C	Temperature, Relative Humidity Pressure

ADDITIONAL PRODUCT INFO
Response Time & Display Update	Display updates every 1 second. After exposure to large environmental changes, all sensors require an equilibration period to reach stated accuracy. Measurements employing RH may require longer periods particularly after prolonged exposure to very high or very low humidity. WBGT requires about 8 minutes to reach 95% accuracy and about 15 minutes to reach 99% accuracy after exposure to large environmental changes.
Data Storage	Logged history stored for every measured value. Auto-store interval settable from 2 seconds to 12 hours*, overwrite on or off. D1: >13,000 data points, D2: >7,000 data points, D3: >6,000 data points.
Bluetooth® Data Connect Option	Wireless range up to 100ft\|30m. Compatible with Kestrel LiNK app for iOS (model 4s and later) and select Android products (Android 4.3 and higher) (See website for complete list of compatible 3rd party apps).
Certifications	CE certified, RoHS, FCC, IC tested and WEEE compliant. Individually tested to NIST-traceable standards.
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.
Battery	User-replaceable CR2032 (included).
Shock Resistance	MIL-STD-810g, Transit Shock, Method 516.6 Procedure IV; unit only; impact may damage replaceable impeller.
Sealing	Waterproof (IP67 and NEMA-6)
Battery Operational Temperature Limits	0° F to 140 ° F \| -18 °C to 60°C Measurements may be taken beyond the limits of the operational temperature range of batteries by maintaining the unit within the operational range and then exposing it to the more extreme environment for the minimum time necessary to take reading.
Storage Temperature	-22.0 °F to 140.0 °F \| -30.0 °C to 60.0 °C.
Size & Weight	2.4 x 1.8 x 0.9 in \| 6 x 4.5 x 2.3 cm 1.2oz \| 34g (Lithium battery included)