METAL BODY LOW VOLTAGE INSULATION TESTER(FEATURES & BENIFITS):Rugged design to withstand industrial environment Metal body with collapsible Steel handle In-built hand-driven brushless AC generator and static rectifier to supply Stabilized DC voltage Guard terminal to eliminate surface leakage current Cross coil movement, sintered anti-friction bearings and delrin-moulded gears ensures trouble free operation 66mm logarithmic scale confirms to IS 2992-1987 Optional : Voltage measurement up to 500VACDC.