This compact ultra-light tool can help you measure wind speed whether you're flying RC planes, drones, wings, 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: plastic 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