Fluke ST120 GFCI Socket Tester

The Fluke ST120 GFCI Socket Tester provides a fast, visual way to check that each wire in an outlet is correctly connected to the building’s electrical system. Its three bright LEDs and integrated wiring chart allow electricians, technicians, and DIYers to identify common wiring issues in seconds, including reversed phase and neutral wires, open ground, or open hot.

The built-in GFCI test button allows users to verify the proper function of GFCI-equipped outlets with a single push. If the GFCI trips correctly, the outlet is functioning properly. If not, corrective action is needed, helping prevent potential electrical hazards.

Designed for ease of use and speed, the ST120 ensures quick visual identification of six wiring conditions:

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

Compact, durable, and rated CAT III 300 V, the Fluke ST120 is ideal for electricians and technicians who need a fast, accurate, and portable solution for verifying outlet wiring and GFCI functionality.

Features

• Simple Operation – Plug in and verify wiring instantly using bright LEDs and wiring chart.
• GFCI Testing – Integrated one-button test confirms GFCI outlet functionality.
• Six Wiring Conditions – Quickly identify open ground, open neutral, open hot, reversed hot/neutral, reversed hot/ground, or correct wiring.
• Bright LED Indicators – Easy-to-see red and green LEDs for fast visual feedback.
• Compact & Portable – Lightweight and easy to carry for field work.
• Reliable Safety Rating – Rated CAT III 300 V for safe operation in standard electrical environments.
• Voltage Compatibility – Works with 110–125 V AC, 50/60 Hz outlets.
• Low Power Consumption – Consumes just 0.3 W, ensuring efficient operation.
• Durable Construction – Built for everyday use on the jobsite.
• Two-Year Warranty – Backed by Fluke’s standard two-year warranty for peace of mind.

Includes

• Fluke ST120 GFCI Socket Tester