The Extech MG302 CAT IV Megohmmeter and MultiMeter with PC Interface is a 2-in-1 tool featuring a 1000V insulation tester as well as a True RMS multimeter. Test voltage range from 125V, 250V, 500V, 1000V. Measures insulation resistance from 0.001M? to 4000M?. Features a USB receiver connectable to any PC that wirelessly receives measurements and data.