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Yellow Fluke ST120+ GFCI socket tester with three LEDs and test button

ST120+ GFCI Socket Tester Audible Beeper electrical system tool

SKU CH-J8R7-K3YJY

A GFCI socket tester with audible beeper and bright LEDs identifies miswired outlets and verifies breaker connections

  • Team affiliation1 Piece
  • Key featuresOutlet Tester, Cat Iii 300 V, Corded Electric, false
  • Overall height2.28 L x 2.9 W x 0.98 H inches
  • Overall width2.28 L x 2.9 W x 0.98 H inches
  • Overall length2.28 L x 2.9 W x 0.98 H inches
  • Product weight0.07 kg
  • GFCI test button verifies outlet safety
  • Audible beeper identifies breakers without extra trips
  • Bright LEDs show miswiring at a glance
  • Compact 2.28 L x 2.9 W x .98 H in design fits any tool bag
  • CAT III 300 V rating protects up to 300 volts

GFCI Socket Tester With Audible Beeper

The Fluke ST120+ is a compact electrical system tool for electricians and technicians who need to verify outlet wiring and GFCI function. It plugs directly into a standard receptacle to check for correct connections and fault conditions.

Cat III 300 V Rating For Outlet Testing

The tester is rated for Cat III environments up to 300 V, covering typical residential and commercial branch circuits. It identifies common miswires such as open ground, reverse polarity and open neutral, while the integrated GFCI button confirms protection device operation.

Bright LEDs And Rugged Housing

Bright indicator LEDs provide immediate visual status of the outlet condition. An audible beeper sounds when voltage is present and can be silenced, allowing breaker identification without repeated trips. The rugged housing measures 2.28 L x 2.9 W x 0.98 H inches and weighs 0.07 kilograms for durable daily carry.

How it compares

Measured against everything we stock in Multimeters & Electrical Testers, at today’s prices. Recalculated every night.

Price $35.99
Pricier than about 58% of the 971 comparable items (median $30.99).

Specifications

Product
Brand nameFluke
Product typeMultimeters, Tach & Dwell Meters
Size & build
Overall height2.28 L x 2.9 W x 0.98 H inches
Overall width2.28 L x 2.9 W x 0.98 H inches
Overall length2.28 L x 2.9 W x 0.98 H inches
Product weight0.07 kg
More details
Team affiliation1 Piece

Questions about this item

Will the Fluke ST120+ GFCI Socket Tester work safely on older household wiring that may not have a ground?

The tester checks each wire connection and its bright LEDs show miswired outlets, while the CAT III 300 V rating covers typical residential circuits.

How can I confirm the Fluke ST120+ is detecting voltage correctly after I plug it in?

The audible beeper sounds whenever voltage is present and stops when the breaker is switched off, giving immediate feedback.

Does the Fluke ST120+ GFCI Socket Tester come with a case or do I need to buy one separately?

Only the tester itself is included; Fluke cases and other accessories are sold separately.

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