E4worlds Pocket LCD Digital Anemometer Air Wind Speed Scale Gauge Meter Thermometer Gm8908 Ideal Tool for Windsurfing, Sailing, Fishing, Kite Flying and Mountaineering Digital LCD anemometer for wind speed and temperature measuring Ideal tool for windsurfing, sailing, fishing, kite flying and mountaineering, etc Powered by 1 x CR2032 button cell (Button Cell included) With a chain for easy carrying with Could be used for industrial and home purposes, such as measuring wind speed, temperature of CPU, air-conditioner, air blower, etc