This is a high quality mini digital anemometer、 which is very useful in measuring wind speed and termperature.Features:Measure wind speed and temperature.High precision pressure sensor.Quick response、 external thermistor.Wind speed range: 0-30 m / s.Wind speed unit: m/s、 km/h、 m/min、 knots、 mph.Current / max. / average wind speed reading.Temperature display in / ??FWind temperature range: -10 - 45 ??C (14 to 113 ??F)Large、 easy to read LCD display with backlight.Data hold function.Automatic / manual stop.Powered by a CR2032 3V battery (not included)Specifications:Air Speed:Range: 0-30m/s、 0-90 km/h、 0 - 5860ft/min、 0-65mph、 0 - 55KnotsResolution: 0.1m/s or 0.3km/h、 19ft/min、 0.2mph、 0.2KnotsThreshold: 0.1m/s or 0.3km/h、 39ft/min、 0.2mph、 0.1KnotsAccuracy: ?Ħ 5%Air Temperature:Range: -10 - 45、 14 - 113??FResolution: 0.2、 0.36??FAccuracy: ?Ħ 2、 ?Ħ 3.6??FPower Supply: 1 * 3V CR2032 battery (not included)Thermometer: NTC thermometerOperating Temperature: -10 ~ 45 (14 ~ 113??F)Operating Humidity: Less than or equal to 90% RHStorage Temperature: -40 ~ 60、 -40 ~ 140??FPower Consumption: About 3mAItem Size: 10.5 * 6 * 2cm / 4.13 * 2.36 * 0.79inWeight: 63g / 2.22ozPackage Including:1 * Anemometer1 * Strap1 * User Manual"