A Rotary Encoder having 200 pulse per rotation? Awesome! This product gets an output in gray code, this can easily be interpreted using a microcontroller and therefore, finding out about the shaft, its direction, and the amount. A very interesting feature is that it allows adding feedbacks to motor control systems. What can it be used for? Many things ranging from precise input knob to balancing robots and navigations. Note that a set of screw coupler comes with this encoder in which is very useful since it’s capable of being attached to ANY 4mm shaft out there.