Aimilar DC 6-50V Mechanical Hour Meter Hourmeter for Diesel Engine Generator Boat Motorcross Motor Truck Tractor Power voltage: DC 6-80V.Indicator range: 0-99999.9 Hours. Completely sealed, dustproof and dampproof It is widely used for tracking engine hours and will allow you to keep track of engine hours so you can monitor service intervals. Low power consumption Reliable Performance.