Product:Single Mag Timer; LED; 3/4 in. x 3 in. x 5 in. Size; Part Number:607980 Details: A new concept utilizing the latest digital integrated circuitry. 100% solid state with bright L.E.D. readout. Compact 3/4-inch x 3-inch x 5-inch size. This unit measures the change of inductance in the magneto coil and will not give a false reading. Can also be used as a relay coil tester to determine whether the coil is functioning. Powered by a 9-volt batter. Single Mag Timer.