The Motwane IT-51 is a microprocessor based Digital Insulation tester designed for testing of all types electrical installation like transformers, switchgear, motors, generators and utility substation equipments. The instrument automatically performs Polarization index by selecting PI mode. IT-51 has a large LCD blue backlit display, it shows leakage current in scrolling form along with IR value and PI value. It is rechargeable battery operated and AC mains provision for battery charging.