Features:This is a type of digital anemometerused to measure wind speed and wind temperature.This handy sized anemometer with strap are convenient to carry.LED back light design for operation under poor illumination.Current / max / average wind speed reading.Great tool for windsurfing, sailing, fishing, kite flying and mountaineering.Also use it for industrial and home purpose such as measuring wind speed, temperature of CPU computer fans, air blower.Specifications:Thermometer: NTCTemperature Measuring Range: -10 ~ 45 (14~113)Resolution: 0.2, 0.36Accuracy: 2, 3.6Air VelocityRange: 0 - 30 m/s, 0 - 90 km/h, 0 - 5860 ft/min, 0 - 65 mph, 0 - 55 KnotsResolution: 0.1 m/s, 0.3 km/h, 19 ft/min, 0.2 mph, 0.2 KnotsThreshold: 0.1m/s, 0.3 km/h, 39 ft/min, 0.2 mph, 0.1 Knots.Accuracy: +/- 5%Operating Humidity: Less than or equal to 90% RHStorage Temperature: -40 ~ +60 ( -40 ~ 140)Battery Type: 3V CR2032*1PCSLength: 11.8cm/4.65inWeight: 110g(approx.)Package Includes:1 x Anemometer1 x Battery