DURACOMM~Rack Mount 80A Meter Comes with a built-in meter that can monitor voltage and amperage by simply switching the Knob that is located to the right of the display (Note: the RLP-8012 can only monitor one input at a time).The RLP-8012 has auto ranging input voltage from 100 to 260 VAC and comes with four layers of protection short circuit, overload, over voltage, and over temperature..