A Kestrel DROP is the world s easiest-to-use rugged and waterproof environmental data logger. The DROP allows you to monitor and record the conditions of any environment and easily view chart record and monitor real-time and historical data on your phone tablet or other iOS/Android Bluetooth-enabled device. The Kestrel DROP D1 data logger can be placed wherever needed to log temperature with the data logs retrieved wirelessly and automatically to your device s Kestrel app when within wireless range (up to 100 or more line of sight). Logging intervals range from 2 seconds to 12 hours and real-time or logged data can be shared via email text or social media. 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. The Kestrel DROP is available in two other models if you need additional functionality – the Kestrel DROP D2 Temperature and Humidity Logger and the Kestrel DROP D3 Temperature Humidity and Pressure Logger.