This meter is a sophisticated amp hour meter that also displays system voltage and charge or load amps with the push of a button. Seven other data monitoring functions provide information on battery efficiency, battery life, minimum battery voltage, maximum battery voltage and more. This data and the user programmed set points are stored even when disconnected from the battery. Easily installed in a standard double gang switch box, this meter may be located hundreds of feet from your battery. The TriMetric draws only 32 milliamps (16 mA with the bright LED display turned off). The TriMetric requires a 100A/100mV or 500A/50mV shunt, and unshielded wire.