Handheld Barometer Altimeter Thermometer Stopwatch -- Gives Temperature/Altitude/Time/Forecast -- An excellent device for climbers, hikers, forecasters, hunters, balloonists, etc. With one single device, you can now get the current weather conditions, forecasting, and altitude. -- Altimeter tracks cumulative vertical ascent & descent. Also monitors difference between current and reference altitude. Altitude history and bar graph for past 12 hours. Altitude can be measured from-1600 to 23,000 feet ( -500m to 1000m ) with 1m resolution. -- Weather forecast symbols indicate weather from sunny to rainy. Device measures temperatures from -4-¦ to 158-¦F (-20-¦ to 70-¦C). Also functions as a 12/24 hour alarm clock. -- Uses 2 pieces CR2032 size 3V battery (Included).