1.Insulation test voltage 250V/500V/1000V/2500V 2.Insulation test range0.01M~100.0GOmega 3.Short circuit current:3mA 4.Automatic calculation of polarization index/Absorption ratio 5.Storage function/Comparison function 6.Voltage detection and alarm function 7.Automatic discharge function/Timing measurement 8.The line voltage detection 9.DC voltage/AC voltage test 10.On off test 11.Automatic shutdown 12.Low voltage indication