The Anemometer is a mini wind speed and wind temperature tester. This light-weight device is equipped with the latest magnetic sensing technology which can directly display the air flow speed on the LCD display. It is a perfect tool for sport events wind measurement navigation HVAC and other areas.Requires 3 x AAA 1.5V batteries (not included available separately).Dimensions: 160 x 50 x 28mm.Weight: 118g.Wind Speed Accuracy: ±5% +0.5Temperature Accuracy: ±2°C.Wind Speed: 0 - 30m/s 0.1m/sTemperature Range: -10 - 50°CBeaufort Wind Scale: 14 - 122°C 0 ~ 12 levelSampling Rate: 2/s (sampling rate is twice per second)Overload Indication: OL Shows "" OL""MAX/AVG MAX/AVG Shows ""MAX/AVG""Data Hold HOLD Shows ""HOLD""Backlight BL: Manually turn on or offAuto Power Off: 5mins (automatically power off after 5mins without operating)Low Battery 3.0 - 3.5V (shows low battery prompt when power is 3.0 - 3.5V)Wind Chill Notification: Windchill shows""windchill""