BM878 Insulation Multimeters combine a digital insulation tester with 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 Brymen BM878 Insulation Multimeter are ideally suited to help you with your tasks and at a cost that is far less than buying the two products or three products.