HOLDPEAK 2pack 817A Digital Anemometer Pocket Sized Wind Speed Meter for Measures Wind Speed, Temperature, Wind Chill with Backlight and Auto Power Off (CE,ISO,ROHS,GMC) Steday Wind Speed Measurement & High AccuracyWind Speed Range: 0.3-30m/s and Accuracy: 0.1dgts Wind Speed/Temperature Measurement It measures wind speed in 5 units:mph, m/s, ft/min, knots, km/h; Temperature in 2 units:Celsius,Fahrenheit More FeaturesHOLDPEAK 817A's Features include wind chill,temperature,wind max/average/current mode, back light,manual/auto power off,NO USB PORT Wide Range of Applications Ideal for model plane pilots,shooters,hikers,and other outdoor enthusiasts Quality AssuranceHOLDPEAK provide 1 year warranty and lifetime technical support.If there is any product issue,please feel free to contact us!