FLUKE ST120 GFCI SOCKET TESTER. The bright, easy to read LEDs provide you with the information you need to easily recognize a miswired outlet. Plus, using the included table, you know how the outlet is miswired so you can repair it.
Reliable and intuitive, the Fluke ST120+ quickly identifies wiring issues with clear visual indicators and an audible alert for GFCI testing. Its compact design makes it ideal for fast, on-the-go diagnostics in residential and commercial settings.