This compact and portable 8-in-1 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 & Ultra-light: pocket-sized 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 power-off 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. Specifications: Model: TL-303 Material: ABS Color: Black Power Supply: 1 * rechargeable 300mAh lithium polymer Wind Speed Range: 0~30m/s; 0~5860ft/min; 0~55knots; 0~90km/h; 0~65mph Resolution: 0.1m/s; 19ft/min; 0.2knots; 0.3km/h; 0.2mph Accuracy: 5% Wind Chill Range: -40~10C (0~30m/s); -49~50F (0~65mph) Resolution: 0.1C; 0.1F Accuracy: 1C; 1.8F Temperature Range: -29~70C; -20~158F Resolution: 0.1C; 0.1F Accuracy: 1C; 1.8F Relative Humidity Range: 0~100%RH Resolution: 0.1%RH Accuracy: 3%RH Heat Index Range: 21.1~54.4C (0~100%RH); 70~130F (0~100%RH) Resolution: 0.1C; 0.1F Accuracy: 2C; 3.6F Dew Point Range: -29~70C; -20~158F Resolution: 0.1C; 0.1F Accuracy: 2C; 3.6F Barometric Pressure Range: 10~1100hpa; 10~1100mbar; 0.29~32.48inHg Resolution: 0.1hpa; 0.1mbar; 0.01inHg Accuracy: 1.5hpa; 1.5mbar; 0.05inHg Altitude Range: -700~9000m; -6000~30000ft Resolution: 1m; 1ft Accuracy: 12m; 50ft Item Size: Approx. 11.5*4*2cm / 4.53*1.57*0.79in Item Weight: Approx. 47g / 1.66oz Package Size: Approx. 16.2*10*2.3cm / 6.38*3.94*0.91in Package Weight: Approx. 100g / 3.53oz Note: Please read the Users Manual before use. Please use calibration function with caution. Packing List: 1 * Digital Anemometer 1 * USB Charging Cable 1 * Storage Pouch 1 * Lanyard 1 * Users Manual(English)