SenDEC Corporation of Fairport offers engine hour meters. Simply wrap the pickup wire around the outside of any spark plug wire and the meter records running time and displays in on the LCD. This is useful information for maintenance intervals called out by engine manufacturers for oil changes, belt replacements, lubrication, etc. On time maintenance extends equipment life and keeps equipment at peak operating performance....the SenDEC meter makes this possible. No batteries are required and the LCD can be read at all times since there is a long life 12 year battery inside. The unit is water tight and epoxy filled to withstand extreme shock, vibration and weather conditions.