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The Megger MIT1525 Insulation Resistance Tester 15KV provides preconfigured diagnostic testing including 15KV Insulation Resistance (IR), Polarization Index (PI), Dielectric Absorption Ratio (DAR), dielectric discharge (DD), Step Voltage (SV) and ramp test which gradually Megger increases voltage up to a selected level while graphing current vs. voltage (graph downloadable).