The Southwire 40022S GFCI Receptacle Tester quickly identifies the most common wiring faults associated with 3-wire 120V outlets. Just plug it into the outlet, and the indicator lights quickly tell you if the outlet is wired correctly. Press the red button to verify that a GFCI circuit is functioning properly.• Tests standard 120V outlets• Tests Ground Fault Circuit Interrupter (GFCI) outlets and circuits• Performs 7 tests: GFCI functional test, open ground, open neutral, open hot, hot/ground reversed, hot/neutral reversed, and wired correctly• Three light indicators identify wiring faults• Wiring legend on the top and bottom of the tester so it's always easy to see• UL listed• 3.6" x 1.7" x 1.0" Performs 7 tests Wiring legend on top & bottom is always easy to see UL listed | Southwire 40022S GFCI Receptacle Tester in Red