The Grayhill 61C22-01-04-02 Optical Encoder Rotary Incremental Push Button is a high-quality, American-made product designed for precise rotary motion control. This unit features a push button for easy operation and a durable construction suitable for various industrial applications. With the trusted Grayhill brand and reliable performance, this optical encoder is a valuable component for ensuring accurate and efficient motion control in a wide range of settings.