MM series rotary encoder from Electroswitch. Extremely rugged. Benefits: Compact Size, Easy Insertion into PCB, Multiple Functions Save Panel Space, Wave Solder Applications, Addition of Push button allows Scroll and Select Function, Long Service Life of over 50,000 cycles with Low Contact Resistance, and Maximum Switch Position Accuracy. Durable construction and an enclosed, high temperature resistant design make the MM Series ideal for wave solder applications. Contacts are insert molded in place for lifetime performance and switching accuracy. Available options include concentric shafts as well as shaft and panel seals. These switches are highly versatile and economically customized.