Discountinkllc &copy; 12v to 36v Truck Tractor Diesel Outboard Engine Hour Meter Rectangular DC12-36V Hour Meter Hour Meter Gauge Tracking Time For Boat / Tractor / Car / Engine Use for tracking time on machinery such as boats, cars, trucks, tractors or any other device where time is used to determine oil change intervals, service requirements or where there is a need to record hours operated. Indicating range: 99999.9 hours, when it automatically returns to zero Operating voltage: DC12-36V, Size approx: 5.5x6.0x3.2cm The hour meter timing mechanism contains a quartz oscillator make sure a high degree of accuracy