Two powerful tools in one. The Fluke 1577 Insulation Multimeter combines a digital insulation tester with a full-featured, true RMS digital multimeter in a single, compact, handheld unit, which provides maximum versatility for both troubleshooting and preventative maintenance. Whether you work on motors, generators, cables, or switch gear, the Fluke 1577 Insulation Multimeter is ideally suited to help you with your tasks and at a cost that is far less than buying the two products.