ITEM NAME:BM500A Digital Insulation Resistance 1999M 1000V Tester Meter Megohmmeter Tide.Digital Insulation Resistance Tester. Short circuit current: no less than 2mA. Resistance: 0~1999Mω ±(5%+5),0~1999Mω ±(5%+5). Load current; 2ma. Low Battery Warning: yes. High-pressure warning light output.