Searon DC 12V 24V 36V 48V 60V 72V Mechanical Engine Hour Meter Generator Hourmeter 6-80 Volt Mechanical hour meter DC 6-80 volt Works on 12V 24V 36V 48V 60V 72V DC powered engine It is widely used for tracking engine hours and will allow you to keep track of engine hours so you can monitor service intervals. Read up to 99,999.9 hours CE & RoHS Certification and Warrant 2 Years