Rechargeable Battery Operated Insulation Tester has additional AC voltage measurement feature and has guard terminal for stable reading in humid conditions. The Tester has high voltage indication for added user safety and has the feature of automatic discharge of device. The Tester has 3 ½ digit 0.65 LCD and selectable multi test voltage from 100 V to 1000v DC. The Tester has ac voltage measurement up to 750 V and resistance measurement up to 2000 MOHM and is available in two ranges of 200 MOHM and 2000 MOHM on all test voltages. The Tester has 1 mA short circuit current for faster readings in case of capacitive load. The Rechargeable Battery Operated Insulation Tester has the feature of low noise leads to eliminate use of separate guard lead and is offered with set of low noise 1 metre long leads with multipurpose detachable crocodile clips, test lead pair for AC voltage measurement and battery charger.