Fluke 1507 Insulation Resistance Tester Key Features Rugged, compact advanced insulation resistance tester for electrical contractors and industrial and commercial electricians Automatically calculates Polarization Index and Dielectric Absorption Ratio Makes repetitive tests simple and easy with a Compare (Pass/Fail) function Offers multiple insulation test voltages: 50 V, 100 V, 250 V, 500 V, and 1000 V www.fluke.com/en/product/electrical-testing/insulation-testers/fluke-1507