Industrial Insulation Resistance Tester is widely used in various industrial applications like maintaining cables, transformers, rotating machinery and switch gear for measuring high voltage insulation testing. The Insulation Resistance Tester operates on five test ranges that are 250 V, 500 V, 1000 V, 2500 V and 5000 V. The Insulation Resistance Tester enables Selectable DC or AC [including frequency] voltmeter functions. The Industrial Insulation Resistance Tester is equipped with Guard terminal to shunt surface leakage currents.