This compact and portable 8in1 anemometer can be used to measure wind speed,wind chill,air temperature,humidity,heat index,dew point,barometric pressure and altitude especially when flying an aeroplane,helicopter or drone.Features Compact Ultralight pocketsized product comes with a storage pouch and lanyard for convenient carrying. LCD Display with Backlight Humanized design for easy clear reading. 8 Functions Included Wind speed,wind chill,air temperature,humidity,heat index,dew point,barometric pressure and altitude. Switchable Units Temperature C,F; wind speed m/s,ft/min,knots,km/h,mph. Additional Features Available maximum,minimum and average value of measurement; automatic manual poweroff function; data hold function; calibration function. Wide Application It is suitable for measuring 8 parameters mentioned above when flying an airplane,helicopter,drone,model aircraft,hiking,mountaineering,voyaging,golfing,hunting,shooting,fishing or other outdoor activities.SpecificationsModel TL303Material ABSColor BlackPower Supply 1 * rechargeable 300mAh lithium polymerWind SpeedRange 0~30m/s; 0~5860ft/min; 0~55knots; 0~90km/h; 0~65mphResolution 0.1m/s; 19ft/min; 0.2knots; 0.3km/h; 0.2mphAccuracy 5%Wind ChillRange 40~10C (0~30m/s); 49~50F (0~65mph)Resolution 0.1C; 0.1FAccuracy 1C; 8FTemperatureRange 29~70C; 20~158FResolution 0.1C; 0.1FAccuracy 1C; 8FRelative HumidityRange 0~100%RHResolution 0.1%RHAccuracy 3%RHHeat IndexRange 21~54C (0~100%RH); 70~130F (0~100%RH)Resolution 0.1C; 0.1FAccuracy 2C; 6FDew PointRange 29~70C; 20~158FResolution 0.1C; 0.1FAccuracy 2C; 6FBarometric PressureRange 10~1100hpa; 10~1100mbar; 0.29~348inHgResolution 0.1hpa; 0.1mbar; 0.01inHgAccuracy 5hpa; 5mbar; 0.05inHgAltitudeRange 700~9000m; 6000~30000ftResolution 1m; 1ftAccuracy 12m; 50ftItem Size Approx. 15*4*2cm / 53*57*0.79inItem Weight Approx. 47g / 66ozPackage Size Approx. 16.2*10*3cm / 6.38*94*0.91inPackage Weight Approx. 100g / 53ozNotePlease read the Users Manual before use.Please use calibration function with caution.Packing List1 * Digital Anemometer1 * USB Charging Cable1 * Storage Pouch1 * Lanyard1 * Users Manual(English)