Megger MIT420-EN Insulation Tester, 200 Gigaohms Resistance, 50V, 100V, 250V, 500V, 1000V Test Voltage with a NIST-Traceable Calibration Certificate with Data Insulation tester for testing insulation resistance, voltage, and continuity in electrical installations Autoranging digital meter with TRMS voltage detection Dual digital display with analog arc function to replicate response of analog meters Voltage detection test inhibit function set at 50V for safety Safety rated to European Standard EN61010-1 Category IV, 600V and IP54 rated for protection against dust and splashing water