Searon 12V 24V 36V 48V DC Mechanical Hour Meter Rectangle Gauge Mechanical Engine Hour Meter DC 6-80 volt Fit for 12V 24V 36V 48V 60V 72V DC powered engine. Be appropriate for Standard Industrial engine maintenance, is widely used in engineering machinery, construction vehicles, farm machinery, generators, kilns, pumps, traffic,cranes,cars,etc. Low power consumption Counter never loses.Reliable Performance.