The Fluke 1503 Insulation Tester is compact, rugged, reliable, and easy to use. With its multiple test voltages, it is ideal for many troubleshooting, commissioning, and preventative maintenance applications. Additional features, such as the remote probe on this tool, saves both time and money when performing tests. Insulation test range: 0.01 MO to 2000 MO, Insulation test voltages: 500 V, 1000 V.