Features and Benefits:Two in 1 tool - multimeter and insulation tester. Insulation test voltages 500V, 1000V. True RMS, AC/DC volts, milliamps, continuity, large displayThe Fluke 1577 Insulation Multimeters combine 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