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 D3 data logger can be placed wherever needed to log temperature humidity dew point temperature heat index station pressure density altitude and pressure trend. The data logs can be transferred 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 D1 Temperature Logger.