This anemometer is portable and useful which can measuring wind speed and temperature, it also can show you wind scale and indicate windchill. LCD display with backlight, it is easy to read value at night.    Features:  Measure wind speed and temperature.  Large easy-to-read LCD display with backlight.  Wind speed in Beaufort wind scale bar graph.  Wind chill indication.  Data hold function.  High precision pressure sensor.  Quick response, external thermistor.  Auto/manual power off.  Temperature display in ℃/F.  Wind speed range: 0-30m/s  Wind temperature range: -10 - 45℃ (14-113F)  Current/max/average wind speed reading.  Wind speed unit: m/s, Km/h, ft/min, Knots, mph.  Powered by a 3V CR2032 battery.    Specifications:  Air Velocity:  Range: 0 - 30m/s, 0 - 90km/h, 0 - 5860ft/min, 0 - 65mph, 0 - 55Knots  Resolution: 0.1m/s, 0.3km/h, 19ft/min, 0.2mph, 0.2Knots  Threshold: 0.1m/s, 0.3km/h, 39ft/min, 0.2mph, 0.1Knots  Accuracy: +/- 5%  Air Temperature:  Range: -10 - 45℃, 14 - 113F     Resolution: 0.2℃, 0.36F   Accuracy: ±2℃, ±3.6F   Power Supply: 1 * 3V CR2032 battery (Not Included)   Thermometer: NTC Thermometer   Operating Temperature: -10~45℃ (14~113F)   Operating Humidity: less than or equal to 90%RH   Storage Temperature: -40~60℃, -40~140F   Current Consumption: About 3mA   Item Size: 105 * 40 * 18mm   Item weight: 50g       Package List:   1 * Digital Anemometer   1 * Lanyard   1 * User Manual