Fluke 1664 FC Installation Tester with Pre-Insulation Testing and Fluke Connect. The 1660 series installation testers are the only ones that help prevent damage to connected devices. The new 1660 series is even more powerful, as it allows for quick and efficient testing in accordance with local regulations, protects devices that may be accidentally connected to the system being tested, and facilitates the sharing of test results via your smartphone. It offers 8 essential tests at the push of a button, reducing testing time by up to 40%. Protect your installation and avoid costly mistakes. The Fluke 1664 FC installation tester is the only one with pre-insulation testing, which can warn you of potentially serious and expensive errors. If the installation tester detects that a device is connected to the system being tested, it will terminate the insulation test and provide a visual warning signal, helping to avoid unintentional damage to peripheral devices. The Fluke 1664 FC is the only installation tester that prevents damage to connected devices and offers the user the ability to wirelessly transmit measurement results.