Confirm proper wiring with one easy tool ST-102B The Amprobe ST-102B socket tester with GFCI is an outlet tester used to confirm the proper wiring of US and Canadian standard electrical outlets/sockets/receptacles and those wired with ground fault circuit interrupter (GFCI) in residential & industrial settings. Three incandescent lights and one LED indicate whether an outlet is correctly wired or the presence of five different wiring faults [open ground, open neutral, open hot, hot/ground reverse, and hot/neutral reverse]. The tester is designed to test 110 to 125V AC outlets (standard wall outlets) and is UL and Canadian UL listed for safety. properly wired. If properly wired, push the button on the top of the socket tester. Product Features Tests standard & GFCI sockets/outlets/receptacles for proper wiring (110-125V AC)Verify proper wiring of GFCI (ground fault circuit interrupter) and standard US and Canadianwall outlets with a simple push of a button.Detect five different wiring faults [open ground, open neutral, open hot, hot/ground reverse, and hot/neutral reverse].UL and CSA listed for safety Front What’s a GFCI outlet? Ground fault circuit interrupter (GFCI) outlets are there to protect people from electrical shock, typically used in areas where water is present (bathrooms and kitchens). Normal 120-volt outlets in the United States have two vertical slots and then a round hole centered below them (“ground”). The left, slightly larger slot is “neutral” and the right is “hot”. If an electrical appliance is working properly, all electricity that the appliance uses will flow from hot to neutral. A GFCI monitors the amount of current flowing from hot to neutral, and if there is the slightest difference in current, on the order of a few milliamps, then there is current leaking out somewhere, possibly through somebody"s body. To protect us in this situation, the device very quickly cuts off the power supply to the leaking device, within 20-30 milliseconds, greatly reducing any possible injury from errant current. GFCI protection can be provided either at the outlet by the now familiar outlet with the test and reset buttons, or at the distribution panel by way of a GFCI circuit breaker, which protects all outlets on the circuit it controls. Additional outlets can be protected downstream of the local outlet type with push buttons by wiring the added outlets to the LOAD side of the local GFCI device. Thus, it is not possible to tell if a receptacle is GFCI protected by just looking at it. If any particular outlet doesn"t seem to be providing power, not only should you check the circuit breakers, but also check any GFCI outlets with push buttons in the area. Back To test a standard (non-GFCI) and GFCI outlet with the Amprobe ST-102B: To test a standard outlet (non-GFCI), simply plug the unit into the wall outlet. The lights will automatically indicate whether it is properly wired. If not properly wired, the lights will indicate which fault condition is detected (see photos below). Pressing the GFCI test button on a non-GFCI circuit will have no effect, will not harm the circuit and is safe. To test a GFCI outlet, simply plug the unit into a GFCI protected the wall outlet. The lights will automatically indicate whether it is properly wired. If properly wired, push the button on the top of the socket tester. The “GFCI TESTING IN PROGRESS” LED will momentarily illuminate, then the GFCI socket will trip indicating it is properly wired (note: the outlet may be protected by a nearby GFCI outlet or a GFCI circuit breaker at the electrical panel). To reenergize the outlet, push the “reset” button on the GFCI outlet or reset the GFCI circuit breaker at the panel. If an outlet known to be protected by a GFCI does not trip, call a professional electrician.