Aimilar DC 6-50v Mechanical Hour Meter Gauge Black for Diesel Engine Generator Motor Boat Tractor Power voltage: DC 6-80V.Indicator range: 0-99999.9 Hours. Completely sealed, dustproof and dampproof 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.