ATOPLEE 12V to 36V Truck Tractor Diesel Outboard Engine Hour Meter Rectangular The hour meter timing mechanism contains a quartz oscillator make sure a high degree of accuracy Size(about): 5 x 3.3 x 2cm; Weight: 55g Indicating range: 99999.9 hours; Operating voltage: DC(12~36)V Note:These meters are not water proof, only splash resistant;The item Without the function of "automatically to zero" Widely 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