The SE1 Cable Extension Transducer is a digital encoder version of the compact String Pot series. It is economical and durable with a flexible cable, a spring loaded spool and an incremental optical encoder to detect and measure linear position. Linear Position to 50 inches (1270 mm) Low Cost, Long Life Rugged Polycarbonate Enclosure Free-Release Tolerant Measuring Cable Click below to view datasheet: Drawing, Datasheet, Installation Guide & P/N Configurator