The GRAYHILL part 61K128-050 is an optical encoder rotary that offers precise and reliable rotational position sensing for a variety of applications. It features a flat straight design and is panel mounted for easy installation. With a resolution of 128 counts per revolution (CPR), this encoder provides accurate feedback for rotational movements. The digital square wave output makes it compatible with digital systems, allowing for seamless integration. Additionally, this encoder comes with a cable for convenient connectivity. Overall, the 61K128-050 from GRAYHILL is a high-quality and versatile rotary encoder that guarantees accurate and consistent measurement of rotational position.