Signswise 600p/r Incremental Rotary Encoder Dc5-24v Wide Voltage Power Supply 6mm Shaft Model: incremental rotary encoders, AB two phases. Light weight and small size. Easy installation. 600P/R-600 pulses per revolution. By rotating the grating disk and optocoupler direction which generate counting pulses. Fits for measuring the rotational speed of the object, angle, acceleration, and length measurement.