Fluke 1664 FC DE + TRUTEST multi-function installation tester Advanced license codeProtects devices, shares results wirelessly, and performs seven test steps at the touch of a button.The Fluke 1664 FC installation tester is the only "insulation pre-test" instrument of its kind. If the tester detects that a device is connected to the system under test, it stops the insulation test to help prevent accidental damage. The 1664 FC tester also has Fluke Connect ®, so you can send the test results to your smartphone and collaborate with others. Auto Test performs seven test steps at the touch of a single button, reducing the number of manual connections and reducing the likelihood of errors.Insulation pre-test:Protect the electrical systems. Avoid costly mistakes.The Fluke 1664 FC Installation Tester is the only "insulation pre-test" instrument of its kind that warns you of potentially serious and costly errors. If the tester detects that a device is connected to the system being tested, it s