Pocket Digital Anemometer Windsurfing Sailing Kite Flying Air Velocity Guage Tools Airflow Wind Speed NTC Temperature Meter Description:  This anemometer is very small and light. It is an ideal tool forwindsurfing, sailing and kite flying. You can also use it for industrial andhome purposes such as measuring speed and temperature of CPU computer fans,air-conditioners, airflow over the roof or walls.  Features:  Mini Digital Anemometer  Air Velocity & Temperature Measurement (Comes with Thermometer Feature)  Max/Average air velocity measurement  C/F Temperature unit selection  Specifications:  Air Velocity Specification:  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%.  Air Temperature Specification:  Thermometer:NTC Thermometer.  Range:Between -10°C and 45°C (between 14°F and 113°F)  Storage Temperature:Between -40°C and +60°C, between -40°F and 140°F.  Resolution:0.2°C, 0.36°F.  Accuracy:±2°C, ±3.6°F  Current Consumption:About 3mA  Operating Humidity:Less than or equal to 90% RH.  Item Size: 49 * 21* 112.1mm  Weight: 98g  Package Included:  1 x hand-held anemometer(Battery Not Included)  1 x Instruction Manual