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The Megger MIT1025-US insulation resistance tester measures insulation resistance, voltage, current, and capacitance in high-voltage electrical systems. This multi ranging digital meter performs timed insulation resistance (IR), polarization index (PI), dielectric absorption ratio (DAR), dielectric discharge test (DD), step-voltage (SV), and ramp tests. The unit measures insulation resistance from 10 kilohms to 20 teraohms, voltage from 30 to 660V alternating current (AC) or direct current (DC), current from 0.01nA to 6mA, and capacitance from 10 Nano farads to 25 microfarads. The unit has test voltages in 10V steps from 100V to 2,500V and in 25V steps from 2,500 to 10,000V. It also has 250, 500, 1,000, 2,500, 5,000, and 10,000V set test voltages. The tester is safety rated to European Standard EN61010-1, Category IV, 600V. It is Ingress Protection 65 (IP65)-rated to be dust tight and protection against water sprayed from 6.3mm jets. The MIT1025-US is commonly used by electricians, electrical contractors, and telecommunications workers.