Features: This is a type of digital anemometer used to measure wind speed and wind temperature. This handy sized anemometer with strap are convenient to carry. LED back light design operation under poor illumination. Current / / average wind speed reading. Great tool windsurfing, sailing, fishing, kite flying and mountaineering. Also use it industrial and home purpose such as measuring wind speed, temperature of CPU computer fans, air blower. Specifications: Thermometer: NTC Temperature Measuring Range: -10℃ ~ 45℃ (14℉~113℉) Resolution: 0.2℃, 0.36℉ Accuracy: ±2℃, ±3.6℉ Air Velocity Range: 0 - 30 m/s, 0 - 90 km/h, 0 - 5860 ft/min, 0 - 65 mph, 0 - 55 Knots Resolution: 0.1 m/s, 0.3 km/h, 19 ft/min, 0.2 mph, 0.2 Knots Threshold: 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% RH Storage Temperature: -40℃ ~ +60℃ ( -40℉ ~ 140℉) Battery Type: 3V CR2032*1PCS Length: 11.8cm/4.65in Weight: 110g(approx.) Package Includes: 1 x Anemometer 1 x Battery