Instruction: Output yes if the supporting document can answer the given question. Otherwise, output no.

Input:
Question: Did I Get a Faulty Tester? Works fine on non-GFCI outlets. But, Pops GFCI outlet when plugged in, even before pushing test button?
Document: This tester worked fine for 2 days. The third day it tripped GFCI breakers the minute it was plugged into a GFCI outlet. After sitting a week, it did not trip the GFCI breaker until the button was pushed - one time. When plugged back into the same outlet, it immediately tripped the GFCI breaker without pushing the test button. Makes it worthless for determining if a GFCI outlet is properly wired.
That's super valuable even if you don't have a GFCI. And if you have a GFCI you can test that it actually trips by pushing on the button. That's added value, but not the main course.Nothing wrong so far, let's see how durable it is...
This tester does exactly what it's supposed to do. Unlike some reviewers, I did not have any problem reading the lights. The values matched up with my expectations according to how I knew my outlets were wired (and confirmed with a multimeter).As noted elsewhere, if the ground is not connected for your GFCI outlet (which is allowed by code), you should not expect the test button on this tester to trip the outlet.
The test button *on the outlet* should always trip the circuit if properly wired, so if your GFCI does not have ground connected, you should only rely on receptacle test button and not the tester test button.
This tester doesn't function on ungrounded GFCI outlets. I have learned to just use the internal test functions of the new GFCI outlets I have recently purchased. They have an LED light which assists, along with the test button, to ensure correct wiring and function. I don't believe this tester is necessary.
My highest praise is to say a product works as advertised. This tester works! Very easy to insert into and remove from a plug - not all versions can make that claim. Rugged construction, clear indicator lights and well positioned GFCI test button. Worth the price.
Not much to say about this tester, other then it works perfectly. Have used it to test and replace dozens of outlets, including GFCI.
This gadget combines three useful functions: testing GFCIs, checking for miswired outlets or extension cords, and indicating whether an outlet is live. It is an especially good idea to check all three-wire extension cords for correct wiring before use. I've seen one or two over the years that had the hot wire connected to the receptacle safety ground!This device is essentially identical to theGE 50542 Receptacle Tester, 3-Wire Light Improper Wiring Indicatorwith the addition of the GFCI test, so you don't need both.
Just plain works. Instructions are clear. I can't find anything wrong with it, certainly not the price.Some people have been complaining about difficulty to read the panel on the device. It's not been an issue for me. Besides, if you have done your job right, you would only get the two right-most lights on every time (good wiring and ground).Of course it's not just a GFCI tester.
This tester works as advertised. The self-test button is way too easy to accidentally press. That means a trip back to the breaker box and try to be more careful.
Answer: yes