It is a 2in1 Volt Amp Panel Meter, Measure Voltage Range AC 200-450V,Measure Current Range AC 0-100.0A(with sensor transformer) , Accuracy: 1% +/- 2 digits, small size, high efficiency, long term stable and reliable quality,easy installation and use . Applications:power distribution box, distribution cabinet, regulators, teaching aids, household small distribution box and etc.