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 for operation under poor illumination. Current / max / average wind speed reading. Great tool for windsurfing, sailing, fishing, kite flying and mountaineering. 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% R H 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 Package List