This compact ultra-light tool can help you measure wind speed whether you are flying RC planes, drones, wings, helicopters. The 8-in-1 design can also be used to measure temperature, humidity, wind chill, heat index, dew point, barometric pressure and altitude. < strong>Features: 8 in 1 digital anemometer to measure air speed, temperature, humidity, wind chill, heat index, dew point, barometric pressure and altitude. Selection & deg; C / & deg; F, wind speed units selection: m/s, ft/min, knots, km/h, mph. LCD display with white backlight for clear reading. Wind speed measurement function maximum, minimum and average values (for all measurement modes). Low battery warning, automatic & amp; Manual power off function. Data hold function and calibration function. The beaufort scale will always be displayed according to the current wind speed in all modes. Pocket-sized and ultra-light, comes with a storage case and lanyard for convenient carrying. Note: Please use the calibration function carefully, read the instructions carefully first . Specifications: Material: plastic shell + electronic component Anemometer color: red / blue / black (optional) storage case & amp ; Lanyard color: black Battery: 1 * LIR2032 3.6V button battery (not included) Wind speed range: 0~30m/s; 0~5860 ft/min; 0 ~ 55 knots; 0~90km/h; 0 ~ 65 mph Wind speed unit: m/s, ft/min, knots, km/h, mph Resolution: 0.1m/s; 19 ft/min; 0.2 knots; 0.3km/h; 0.2 mph Accuracy: & moremn; 5% Wind chill range: -40 ~ 10 &deg; C(0~30m/s); -49~50 F (0 ~ 65 mph); Resolution: 0.1 & deg; VS; 0.1 & deg; F Accuracy: 1 & deg; VS; 1.8 & deg; F Temperature range: -29~70 VS; -20~158 F Resolution: 0.1 & deg; VS; 0.1 & deg; F Accuracy: 1 & deg; VS; 1.8 & deg; F Relative humidity range: 0 ~ 100% RH Resolution: 0.1% RH Accuracy: & moremn; 3% RH Heat index range: 21.1 ~ 54.4 &deg; C (0 ~ 100% RH); 70~130 F (0 ~ 100% RH); Resolution: 0.1 & deg; C / & deg; F Accuracy: 2 & deg; VS; 3.6 &deg; F Dew point range: -29~70 VS; -20~158 F Resolution: 0.1 & deg; VS; 0.1 & deg; F Accuracy: 2 & deg; VS; 3.6 &deg; F Barometric pressure range: 10~1100hpa; 10 ~ 1100 mbar; 0.29~32.48inchHg;Resolution: 0.1 hpa; 0.1 mbar; 0.01 inchHg; Accuracy: 1.5hpa; 1.5 mbar; 0.05inHg; Altitude range: -700~9000m; -6000 ~ 30000 feet Resolution: 1m; 1 foot Accuracy: 12m; 50 feet Anemometer size: 11.5 * 4 * 2cm / 4.5 * 1.6 * 0.8in Anemometer weight: 47g / 0.2 oz Package size: 16.2 * 10 * 2.3cm / 6.4 * 3.9 * 0.9in Package Weight: 100g / 3.5 oz