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

This is an industry standard. I've had a lot of electrical work done on my place and was very pleased to see the journeyman electrician had one of these. He sang its praises for being inexpensive, essential for electrical household safety, super bright, fits just right in the hand (or small pocket), and the design is well-labeled and so easily read with the LCD screen. I was quite happy I bought it after hearing all that!!! Great for finding and fixing open ground and so many other issues. Put one in your electrical kit and stay safe!!

Last time I use a multimeter to check the voltage on an outlet, the probe sparked and melted. This experience was very scary and I am not going to try it again.This Klein GFCI outlet tester provides a digital reading just like a multimeter with just plug in which is safer. The extra function of checking correct wiring is a plus because I replaced two old GFCI outlets and this helped double check my work for safety as well as testing if the GFCI trip function works or not.This tester size is longer because of the detail display. And it is because of this, the price is slightly more than other basics tester.

This is really handy. Everyone has the testers that tell if an outlet is hot or not, or if it’s wired correctly, but this one will tell you how many volts is there too.Recently there was a problem and my hot stick and regular tester showed the outlet was good, an acquaintance had one of these and it showed the outlet was only getting around 112V, which is enough to cause a problem for 120V circuits.Very worthwhile to have for electrical work.

I use this to check my plugs, works well, is bright and easy to use.

Works good, but it is a little bulky.

I bought this to test an external GFI adapter, which I had concerns about (as it was a cheap poorly made product). The outlet tester failed the GFI, thankfully, and I bought something better. It successfully tests my outlets in the kitchen and the bathroom too. GFI outlets wear out. Everyone should have a tester.

My husband seems to love this tool to help him verify his outlet wiring jobs. Just plug it in and it tells you of its correct or what's wrong. He uses it on existing outlets as well as we live in an old farm house with things done incorrectly before us.

I really like this tester. solidly built, accurate and holds the measurement if removed from socket.