Extech MG320 CAT IV Insulation Tester/True-RMS Multimeter tests up to 1kV (1000V) and 20GΩ on motors, generators, transformers, and other electrical components found in industrial predictive maintenance programs. Five test voltages (50V, 100V, 250V, 500V, 1000V) are available with step voltages in 10% increments in a 50% to 120% range. The rugged meter features both Polarization Index (PI) and Dielectric Absorption Ratio (DAR) modes along with continuity and low resistance testing with 20kΩ and zero function for advanced testing.