YES-H-WS-01 is a rugged, high performance, high resolution, low threshold opto electronic anemometer. Its simplicity, rugged and corrosion resistant construction make it well suited for a wide range of wind measuring applications. When rotated by wind, a chopper on the anemometer shaft interrupts an infra red light source, generating pulses from a photo transistor device. The signal is amplied and fed through a line driver. The frequency is proportional to wind speed.