YES-H-WD-01 is a high performance, counter balanced, low threshold and rugged wind vane. It is built upon a linear, wire wound endless potentiometer coupled to the vane by an SS shaft mechanism. This potentiometer has excellent linearity, very low starting torque. The north of the wind vane is marked on its body corresponding to 0 degrees, and also resistance of 20 ohms approximately. The resistance output is linearly proportional to the position of the wind vane.