The Fluke 1587 FC and 1577 combine the features of an insulation tester with a full featured multimeter in one, compact product. Both offer the “two tools in one” feature set, combining a digital insulation tester with a full-featured, true-rms digital multimeter in a single, compact, handheld unit. The result:maximum versatility for both troubleshooting and preventative maintenance. Whether you work on motors, generators, cables or switch gear, Fluke insulation multimeters deliver impressive capability in a single unit. No longer do you need to go back to the truck, shop, or tool crib to get the extra tool you need to get the job done. They are rugged, reliable and easy to use, just what you would expect from Fluke. It all adds up to a breakthrough solution that saves you time and money.