Kestrel DROP D1 Wireless Temperature Monitor and Data Logger
Wirelessly monitor and log your temperature conditions with this tiny handheld unit.

Drop it. Log it. View it. Share it. Know your conditions.
Environmental Measures | |
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Temperature |
Know your temperature conditions anywhere with the small, rugged Kestrel DROP D1 Temperature Logger
- The EASIEST way to monitor and track temperature in almost any environment – wet or dry, indoors or out
- View temperature data wirelessly via Bluetooth Smart on your iOS phone or tablet with the free Kestrel LiNK app
- Store thousands of data points and get months of logging on a single coin-cell battery – customize logging rate, connections, and temperature alerts
- See, save, and share data from multiple DROP loggers with just one phone or tablet –
- iOS 6 installed iPhone 4s, iPad 3rd generation, iPod Touch 5th generation and above.
- Android 4.2 and higher. Works with most Android devices with Bluetooth® low energy, including Samsung Galaxy, Nexus 4, Motorola Droid, and other recent generation phones and tablets.
A Kestrel DROP is the world’s easiest-to-use rugged environmental data logger. It allows you to monitor and record the conditions of any environment and easily access and chart real-time and historical data on your phone or tablet. A Kestrel DROP D1 logger can be placed wherever needed to log temperature with the data logs retrieved wirelessly and automatically to the Kestrel Connect app when within range(up to 100ft.). Kestrel DROP data loggers are designed to be used anywhere you need to track environmental conditions. DROP loggers meet military and international standards for water, dust, and shock resistance (IP-67-30 minute submersion at 1m and MIL-STD-810G drop tested) and are equipped with a sturdy D-ring for hanging wherever needed.
DROP D1 Was Featured in Backpacker Magazine:
"How many times have you been out in the backcountry and wondered, 'How cold did it get last night?' or 'Exactly how hot was that scorching hike?' We wonder that all the time when we're out testing, and now with the Kestrel DROP we finally have the data we want."
Use a DROP Anywhere - Small, Accurate, Rugged and Waterproof
Kestrel DROP loggers are designed to be used anywhere you need to track environmental conditions. 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).
The Kestrel DROP D1 employs a sealed precision thermistor mounted externally and thermally isolated for rapid response to monitor and record temperature over an operational and specification range of 14°F to 131°F (10°C to 55°C) within +/- 0.9°F (0.5°C) accuracy. Each Kestrel DROP Data Logger is powered by one easily replaceable CR2032 lithium coin cell battery that will last up to 4 months (typical conditions and logging/connection settings). The DROP D1 holds more than 13,000 temperature readings.
DROPs Are Powered by the Kestrel LiNK App
DOWNLOAD KESTREL LiNK FOR ANDROID
Kestrel LiNK is the free app that powers the DROP loggers. With Kestrel Connect, you can view real-time readings from any DROP logger within wireless range (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 log is viewable as a scrolling graph with detailed data for each logged point. The 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. Send and share real-time and logged environmental data via email, Facebook or Twitter.
Requirements:
- iOS 6 installed iPhone 4s, iPad 3rd generation, iPod Touch 5th generation and above.
- Android 4.2 and higher. Works with most Android devices with Bluetooth® low energy, including Samsung Galaxy, Nexus 4, Motorola Droid, and other recent generation phones and tablets.

American-Made Quality and a Five-Year Warranty
Every Kestrel environmental instrument is designed and built entirely in the USA. Kestrel’s history and focus on quality and ruggedness is reflected in the DROP’s industry-leading five-year warranty. Kestrel has been building rugged environmental instruments that help people do their jobs more safely and efficiently for more than fifteen years and has built a reputation for reliability one meter at a time.
Where Can a Kestrel DROP Be Used?
- Bedroom
- Basement
- Attic
- Kennel
- Barn
- Hatchery
- Greenhouse
- Shipping Container
- Airplane
- Ship
- Warehouse
- Factory
- Humidor
- Safe
- Refrigerator
- Field
- Winery
- Forest
- Laboratory
- Classroom
- Training Center
- Kitchen
- Silo
- Shooting range
- Construction site
- HVAC System
Features
- Drop-Tested to MIL-STD-810G
- Floats
- LiNK Wireless Communication to Mobile Devices (Bluetooth low energy)*
- Temperature Sensor (Patented External Isolated)
- Waterproof to IP67 (3'/1M for 30 minutes)
Includes
- Battery - 1 x CR2032
- Certificate Of Conformity (Spec Sheet)
- D-Ring
- Instructions
Connectivity

Kestrel LiNK for iOS & Android
The Kestrel LiNK® App for iOS/Android allows you to Wirelessly connect with iOS and Android devices and remotely view real-time environmental data and receive alerts for changing conditions. Available for your Kestrel 5 Series Meter or DROP Logger, Kestrel LiNK also provides easy transfer of the Kestrel's stored data log, a clear graph of all historical data. Alerts can be customized based on temperature, heat index, wind, or other measurements. LiNK enables easy firmware updates of Kestrel 5 series meters.
Data is transmitted wirelessly via Bluetooth® Low Energy within wireless range (100' line of sight- reduced by walls and obstructions). Mobile device and Kestrel must remain within range to trigger alerts.
Learn more about what the Kestrel LiNK app can do for you.
Download from your App Store
An application that can be used to view and analyze your Kestrel data on an iOS or Android device.
Kestrel LiNK for Windows and MAC
Kestrel LiNK for Windows and MAC provides a desktop solution for data retrieval and export as well as firmware updates. Expanded connectivity options allow you to wirelessly connect LiNK enabled Kestrel 5 Series Meters, using the optional LiNK USB Dongle, or make a wired USB connection with non-LiNK Kestrel 5 Meters using the USB Data Transfer Cable.
Kestrel LiNK for Windows (Size: 10.7 MB)
Kestrel LiNK Version 1.04.04 for Windows
Kestrel LiNK for OSX (Size: 10 MB)
Kestrel LiNK Version 1.04.04 for OSX
Kestrel LiNK Devices on Ambient Weather Network

Kestrel LiNK devices, including the Kestrel 5000 series meters and Kestrel DROP data loggers, can now connect to the cloud-based Ambient Weather Network (AWN) platform for extended remote monitoring capabilities.*
You can set up your Kestrel device at any desired location that has an internet connection and then view the onsite conditions from wherever you are -- on the AWN app or AmbientWeather.net. You do not have to be onsite to remain in the know about your weather conditions.
Create a free account at AmbientWeather.net
*The Kestrel LiNK device data transfer to the AWN cloud platform functionality is specific to Android devices, as the integration with AWN and the transmission of data via the LiNK app relies on the Android platform's capabilities. The Android device must be within Bluetooth range and connected to the internet in order to transmit data from the Kestrel device to the AWN cloud platform. This allows for real-time monitoring and data analysis from virtually anywhere.
