RL-HM011 Tach/hour meter is a self powered LCD Hour meter,Tachometer and Maintenance Meter.

An internal lithium battery furnishes the power for the monitor.A wire around the spark plug wire of the engine provides both a tachometer signal an indicator that the engine is running.The maintenance meter is used to alert maintenance personnel that a time interval has expired and maintenance should be performed on the engine.Before changing any settings to the ENGINE MONITOR,ensure that the engine is off.