Riva Guns Ltd. | Long Range Sporting Rifles | Auckland New Zealand

Kestrel - DROP D3 Wireless Temperature, Humidity & Pressure Data Logger


The Kestrel DROP D3 is designed to monitor and record a full suite of environmental conditions, including temperature, humidity, heat index, dew point temperature, station 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 Connect App

Kestrel Connect is the free app that powers the DROP loggers. With Kestrel Connect 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 or 30 meters) 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 Connect 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

Download The Free Kestrel Connect APP

(Requirements: iOS 6 installed iPhone 4s, iPad 3rd generation or iPod Touch 5th generation – or any later iOS or hardware configuration. Will not work on iPhone 4, 3GS on 3G or any earlier iPad or iPod generation.)

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.


DROP D3 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 station pressure and density altitude on bullet flight. 


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.


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.


Kestrel DROP Videos



DROP Customer Feedback:

The Kestrel DROP D2 and D3 are absolutely the best kept secret in the cigar industry! In the high tech world we live in, I am now able to keep a vigilant eye over my investment by remotely monitoring the environmentals of my humidor via a simple app on my iPhone. Having the ability to set alerts when humidity and temperature drop or go above ideal conditions is invaluable.  This is a MUST HAVE accessory for anyone with a humidor!


 Which Kestrel DROP is right for me?


    • Dew Point
    • Heat Stress Index
    • Humidity
    • Pressure (Absolute)
    • Pressure Trend
    • Relative Humidity
    • Temperature


      • Bluetooth Smart (Wireless Technology)
      • Data Logger
      • Drop-Tested, MIL-STD-810G
      • IP67 Waterproof
      • Lightweight & Durable

        Who's Using the Kestrel DROP D3 Wireless Temperature, Humidity & Pressure Data Logger

          • Education & Classroom Use
          • Facilities Management
          • Farming & Agriculture
          • Firefighting
          • Hazardous Materials Response
          • Hunting
          • Individual At-Home Use
          • Military
          • Outdoor Event Organizers
          • Precision & Competitive Shooting
          • Research & Technology


          Getting Data Logs off iOS Device:

          There are two ways to Export data off your iOS Device:
          • Directly from the Stats Page or
          • Manage Logging from the Manage page
          Exported in Comma Separated file, or .CSV file which is easily imported into an Excel type program.
          You would then Export to a valid email address or using AirDrop.

            Data Points:

            DROP D1:  Data Points: 13064
            • Logging every 2 seconds - Fills up after 7.5 hours
            • Logging every 10 minutes - Fills up after 90.7 days
            • Logging every 2 hours - Fills up after 544 days
            DROP D2:  Data Points: 8165
            • Logging every 2 seconds - Fills up after 4.5 hours
            • Logging every 10 minutes - Fills up after 56.7 days
            • Logging every 2 hours - Fills up after 340 days. 
            DROP D3:  Data Points: 6220
            • Logging every 2 seconds: Fills up after 3.4 hours
            • Logging every 10 minutes - Fills up after 43.2 days
            • Logging every 2 hours -  Fills up after 259 days


            Battery Life:

            • The battery life will vary based on usage.
            • For baseline conditions and settings*, the battery will last approximately 6 months. *Temp = 75°F, Logging Rate = 10 Minutes, Update Rate = 30 seconds.
            • Battery life will be reduced by:
              • Colder conditions
              • More frequent logging or 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.