Fluke 1507/1503 Insulation Resistance Testers Save both time and money with automatic calculation of polarisation index and dielectric absorption ratio (only available on the1507). Make repetitive tests simple and easy with the 1507s compare (pass/fail) function (only available on the 1507). Repetitive or hard-to-reach testing is easy with the remote test probe. Live circuit detection prevents insulation test if voltage > 30V is detected for added user protection. Auto-discharge of capacitive voltage for added user protection. AC/DC voltage: 0.1 V to 600V. 200mA continuity. Features: Insulation test range: 1507: 0.01 MW to 10 GW 1503: 0.1 MW to 2000 MW Insulation test voltages: 1507: 50V, 100V, 250V, 500V, 1000V 1503: 500V, 1000V Resistance: 0.01W to 20.00 kW. Save battery power with auto power off. Read measurements easily with large, backlit display. CAT IV 600V over-voltage category rating for added user protection. Remote probe, test leads, probes and alligator clips included with