An anemometer is a tool used to measure wind speed. The name comes from the Greek word for wind, anemos.
There are many different tools to measure wind speed, from complex (acoustic, ultrasonic, laser Doppler, and pitot tubes) to very simple (wind socks).
This vane anemometer works like an electric fan in reverse. Whenever wind pushes the vanes and spins the shaft, the mechanical force is converted to electricity. This signal corresponds to wind speed measurement; stronger wind produces a higher measurement. Since it’s digital, it can also convert the measurement to different scales, as well as calculate the volume of airflow.
Anemometers are great for sailing, archery, kite and drone flying, and many other outdoor hobbies.