Qiorange 12v to 36v Truck Tractor Diesel Outboard Engine Hour Meter Rectangular Brand new and high quality The timer has a 6 digit display with the least significant digit being 1/10 hour (99999.9) operates on in put voltages from DC Volts 12-36 DC The hour meter timing mechanism contains a quartz oscillator which provides a high degree of accuracy service requirements or where there is a need to record hours operated