Vane Anemometers work on the principle that a freely spinning turbine will rotate at a speed that is directly proportional to the wind speed. With a quick calibration, a device can then display a wind speed measurement. A Vane Anemometer is a type of wind meter that is used to measure wind velocity and can be used to calculate volumetric flow. These small, easy to use devices are most commonly used in HVAC monitoring, monitoring airflow equipment, and exhaust monitoring. We have Lutron Make AM4201 model. Please contact for more information.