Resetable LCD Hour Meter for Marine and Outdoor Applications. These hour meters are Water Proof. 

For use on any equipment where hours of operation want to be monitored such as cars, boats, trucks, generators, airplanes, heavy equipment, lawn tractors and others.

• Resetable to zero - The hour meter can only be re-set to read Zero by temporarily shorting terminal P (positive) to terminal R (reset). It is no longer necessary to purchase a new hour meter when changing engines. Mearly reset the hour meter to zero.