Excella Electronics manufactures Speed Monitoring Device. Excella Electronics is an ISO9001:2008 and CE certified company. Excella Electronics also manufactures Power Supplies, Tachogenerators, Shaft Couplings, Static Eliminators, Stepper Motors, Flexible Shafts, Incremental Encoders, Inductive Sensors, Electronic instruments, Stepper Motor and controller, encoders and Gear Boxes. Speed Monitoring Device is an electronic device that is used to measure the speed of a machine. The Speed Monitoring Device can measure speed from 4 rpm to 4000 rpm and display the results on a 4 digit, 7 segment display. The Speed Monitoring Device has one analogue output and 4 relay outputs. It comes in a strong, compact housing and is very precise and accurate.