Fluke ST120+ GFCI Socket Tester with Beeper

Fluke ST120+ GFCI Socket Tester with Beeper

The Fluke ST120+ is a professional receptacle tester designed to help verify outlet wiring quickly and clearly. Plug the tester into a standard or GFCI receptacle and use the three bright LED indicators to identify correct installation or common wiring problems. The included chart makes results easy to interpret, helping electricians, maintenance professionals, inspectors, and do-it-yourself users work with greater confidence.

Audible alert for faster circuit identification

The integrated beeper sounds when voltage is detected, helping you identify the circuit connected to an outlet without repeated trips between the receptacle and electrical panel. With the Fluke ST120+, plug into the outlet, move to the breaker panel, and listen as the alert changes when breakers are switched. The audible function can also warn of hazardous voltage at the receptacle, including when wiring is incorrect. For offices, hospitals, and other environments where sound may be disruptive, the beeper can be switched off.

One-button GFCI testing

An integrated GFCI test button provides a convenient way to check whether a GFCI-equipped outlet trips as expected. Press the button to initiate the test, then verify the receptacle response before moving on to the next outlet. The ST120+ helps streamline routine electrical checks while supporting safer troubleshooting practices.

Six wiring conditions at a glance

• Correct installation
• Open ground
• Open neutral
• Open hot
• Hot and neutral reversed
• Hot and ground reversed

The Fluke ST120+ GFCI Socket Tester combines simple plug-in operation, clear visual indicators, audible voltage detection, and integrated GFCI testing in one compact tool. Built by Fluke Corporation and identified by part number ST120+, it is a practical choice for fast outlet verification and common wiring fault identification.

Features:

• Simple operation: Plug into a receptacle and use bright LED indicators to verify correct wiring or identify common problems in standard and GFCI outlets.
• Audible voltage alert: Use the beeper to detect voltage and help identify whether a circuit breaker is switched on or off.
• Integrated GFCI test: Press the dedicated test button to check whether a GFCI-equipped outlet trips as expected.
• Six wiring indications: Quickly identify correct installation, open ground, open neutral, open hot, hot and neutral reversal, or hot and ground reversal.
• Selectable beeper: Switch the audible alert off when working in sound-sensitive environments.