Klein Tools RT250 GFCI Outlet Tester with LCD Display, Electric Voltage Tester for Standard 3-Wire 120V Electrical Receptacles

no wonder it is the industry standard. Works wonderfully and provides everything one needs to test GCFI outlets. Basic stuff for your tool chest.

Great outlet tester, it is easy to use and fits anywhere on my pouch. It is sturdy incase you drop it. It is accurate and fast.

Excellent tool. Gives information about wiring of receptacle. Can test GFCI. Also tells incoming voltage. Display is very nice and lighted.

This outlet tester gives me a lot of peace of mind when working around the house. It’s simple to use—just plug it in, and the bright LCD display gives clear, easy-to-read results. The color-coded indicators and built-in GFCI test function make it incredibly functional for quickly checking outlets and ensuring wiring is safe.It’s also reassuring to know I’m catching potential issues before they become bigger problems. The build quality feels solid and durable, so I don’t worry about it failing when I need it most. It works well every time I’ve tested it, even compared to a more expensive professional tester.This is a perfect tool for homeowners or DIYers looking for something safe, accurate, and functional to check their electrical systems.

Voltage reads 2V high. Other than that -- OK.

Works great. Plug it into an electrical socket and it tells you if it’s wired correctly. Easy to use and operate.

I have one of those 3 LED testers already, the ones with the 2 yellow and one red light... and has a legend on it so that you can tell what is what. Works great... only issue is that when I was working outdoors or in a brightly lit room, it wasn't so obvious which LED were lit. So I bought the Klein as it wasn't a bad price and had the built in GFCI too. My old set, I had a separate GFCI tester which also worked great but just meant I had 2 separate testers. I played with the Klein soon as I got it having installed the batteries (Klein supplied I might add!!!!). You need to hold the power button down a couple of seconds and then the LCD comes alive. I tried it in various outlets around the house and found it to be a really effective device. The unit has only 2 LED's and there's no mistaking when they light up, both bright... A green one which clearly means OK and a red one meaning a fault in the wiring has been detected. I already had a purpose made miswired test lead I used for verifying the fault detection capability. Works great. I also like that it provides a reading of the actual voltage detected. It's not just a passive device.I have only one minor concern... When I put this in my toolbox I'm worried about something resting on the power switch and running the batteries down, so for now, having already carefully cut around the edge of the packaging, I'm keeping it in the packaged plastic. Might be overkill and maybe I'll buy a protective case for it if I feel inclined but for now, perfectly happy with the device and definitely recommend over the typical passive receptacle testers, even though they may be half the price.

This is a basic, essential tool for confirming wiring safety in your home. I noticed that the top half of an outlet was behaving abnormally, and this tool confirmed my suspicions in less than a minute. When I replaced the outlet, I broke it apart and found arcing scorch carbon on the contacts, a definite fire hazard.Do yourself a safety favor and buy one of these. Their very inexpensive for their worth and they come from a quality manufacturer that has been well-known for decades.