Acoustic resonance anemometers are a more recent variant of sonic anemometer. A second, shorter mast carried an anemometer and wind vane. Modern "aerovanes" combine the directional vane with an anemometer (a device for measuring wind speed). One of the other forms of mechanical velocity anemometer is the "vane anemometer". This velocity is measured using the technique of the laser Doppler anemometer. The wind is measured using an anemometer or estimated with a windsock. An anemometer is a device used for measuring wind speed and direction. It involves measuring concentrations as well as vertical wind velocities using an anemometer. It may be described as a windmill or a propeller anemometer. Wind speed is now commonly measured with an anemometer. The anemometer, a device used for measuring wind speed, was invented in 1846. An ultrasonic anemometer has two or three pairs of sound transmitters and receivers. An anemometer is one of the tools used to measure wind speed. The anemometer at Apalachicola Regional Airport registered gusts of before being blown away. It is also called a rotational anemometer.