The GRAYHILL part 61C22-01-04-02 is an optical encoder designed for rotary incremental motion control applications. It features a flat design and weighs only 1.5 ounces, making it compact and lightweight. This encoder provides precise and accurate feedback for rotational movements. It offers a straight digital square wave output with a resolution of 4 cycles per revolution (CPR). The through-hole PC pins make it easy to mount on a PCB. The GRAYHILL part 61C22-01-04-02 is a reliable and efficient solution for various rotary control systems.