The device that measures wind speed is called an anemometer. Anemometers come in various designs, including cup, vane, and digital types, serving to accurately gauge wind velocity. The traditional cup anemometer consists of cups mounted on horizontal arms that spin as wind blows, allowing for the calculation of wind speed based on the rotation rate. Digital anemometers, which often incorporate sensors and advanced technology, can provide real-time data and additional information, such as wind direction. Anemometers are widely used in meteorology, aviation, and various industries to assess wind conditions for safety and operational purposes.