Fluke 1503 Insulation Resistance Tester High-voltage digital megohmmeter has preset and adjustable test voltages for measuring insulation resistance, and also measures leakage current to 2 milliamperes (mA) and capacitance to 20 microfarads Measures voltage to 600V and signals when a voltage greater than 30V is detected Automatically calculates PI and DAR for a detailed indication of insulation condition Performs timed tests up to 99 minutes, and stores up to 99 test results which can be uploaded to a PC Meets EN safety standards 61010-1 and 61557, and is rated for CAT IV installations to 600V and CAT III installations to 1,000V