The new 1660 Series Installation Testers are the only installation testers that help prevent damage to connected equipment. The new 1660 Series is even more powerful, allowing you to perform tests quickly and efficiently in accordance with local regulations, protecting equipment that may be inadvertently connected to the system under test, making it easy to share test results via your smartphone, offering 8 key tests at the touch of a button, reducing test time by up to 40%. Protect the installation. Avoid costly mistakes. The Fluke 1664 FC Installation Tester is the only installation tester with insulation pre-testing, so it can warn you of potentially serious and costly mistakes. When the Installation Tester detects that a device is connected to the system under test, it stops the insulation test and gives a visual warning signal, helping to avoid accidental damage to peripheral equipment. This instrument is ideal for professional users - high-end functionality, advanced measurement functions, yet easy to use. The operation is intuitive and can be easily mastered by field staff at any level.