Milli-Speed Switch KitThe Milli Speed switch sensor with 4 20 mA linear output signal is designed to detect belt slip, belt underspeed, stop motion, low speed or zero speed on bucket elevators, conveyors, air locks, mixers, fans, grinders and many other rotating machines. Totally sealed and simple to calibrate, the Milli Speed works in the harshest of conditions. An analog inductive sensing device located in the nose of the Milli Speed enclosure will detect a metal target.