This compact ultra-light tool can help you measure wind speed whether you're flying RC planes, drones, , helicopters. 8 in 1 design, also can be used to measure temperature, humidity, wind chill, heat index, dew point, barometric pressure and altitude. Features: 8 in 1 digital anemometer to measure air velocity, temperature, humidity, wind chill, heat index, dew point, barometric pressure and altitude. °C / °F selection, wind speed units selection: m/s, ft/min, knots, km/h, mph. LCD display with white backlight for clear reading. Maximum, minimum and average value measurement function(for all measurement modes). Low battery warning, automatic & manual power off function. Data holding function and calibration function. The beaufort scale will be always displayed according to current wind speed in all modes. Pocket-sized and ultra-light, comes with a storage case and a lanyard for convenient carry. Note: Please use calibration function with caution, read the instructions carefully first. Specifications: Material: shell + electronic component Anemometer Color: Red / Blue / Black (Optional) Storage Case & Lanyard Color: black Battery: 1 * CR2032 2.0V Button Cell (not included) Wind Speed Range: 0~30m/s; 0~5860ft/min; 0~55knots; 0~90km/h; 0~65mph Wind Speed Unit: m/s, ft/min, knots, km/h, mph Resolution: 0.1m/s; 19ft/min; 0.2knots; 0.3km/h; 0.2mph Accuracy: ±5% Wind Chill Range: -40~10°C (0~30m/s); -49~50°F (0~65mph); Resolution: 0.1°C; 0.1°F Accuracy: 1°C; 1.8°F Temperature Range: -29~70°C; -20~158°F Resolution: 0.1°C; 0.1°F Accuracy: 1°C; 1.8°F Relative Humidity Range: 0~100%RH Resolution: 0.1%RH Accuracy: ±3%RH Heat Index Range: 21.1~54.4°C (0~100%RH); 70~130°F (0~100%RH); Resolution: 0.1°C/°F Accuracy: 2°C; 3.6°F Dew Point Range: -29~70°C; -20~158°F Resolution: 0.1°C; 0.1°F Accuracy: 2°C; 3.6°F 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 Anemometer Size: 11.5 * 4 * 2cm / 4.5 * 1.6 * 0.8in Anemometer Weight: 47g / 0.2oz Package Size: 16.2 * 10 * 2.3cm / 6.4 * 3.9 * 0.9in Package Weight: 100g / 3.5oz Package List: 1 * Digital Anemometer 1 * Storage Pouch 1 * Lanyard 1 * User Manual(English)