The Kestrel 2500 Pocket Weather Meter comes packed with function. Its measures wind (current/max/average/chill) and temperature (air/water/snow) with total accuracy and has the added benefits of an air pressure sensor that provides altitude and barometric information enabling you to follow changes in air pressure that help predict the weather. Factor in the 2500 s digital altimeter and you have most of the weather information you need for outdoor activities ranging from model airplane flight to rifle practice. The 2500 is individually calibrated and features a backlit screen patented impeller and sensor technology and a quick-response external temperature sensor. The rugged design features a protective cover is fully waterproof and floats (IP-67) and is drop-tested to MIL-STD-810F standards. The 2500 is also made for easy maintenance - no tools are required and the impeller is user-replaceable. The design and function of the Kestrel 2500 make it a valuable tool for military use and for outdoor enthusiasts. Backpackers climbers and skiers can use the barometric pressure and dew point temperature to help predict weather trends and the wind chill and heat stress index sensors can warn of dangerous conditions for long-term exposure. Hunters know that wind speed affects how well animals can hear and smell and for most game activity levels will also rise or fall along with barometric pressure. A Kestrel 2500 can help track weather trends and give you current conditions so you can plan when and where to hunt. And predicting when the fish will bite is easier when you know the weather too - rising or falling pressure increases fish activity and you can measure water temperature by simply submerging the unit and hitting hold to save the temperature. Coin cell battery and lanyard included. The Kestrel 2500 is proudly designed and manufactured in the USA and is backed by a 5-year warranty.