Klein Tools ET310 AC Circuit Breaker Finder, Electric and Voltage Tester with Integrated GFCI Outlet Tester

I started using circuit breaker finders about ten years ago. I was very happy to discover that there was such a thing. At the time, I bought the cheapest one I could find. It worked Ok, but still required some trial and error to find the circuit I needed to turn off. When I saw that Klein Tools made a circuit breaker finder, I thought I'd try it because I've always been impressed with the quality of Klein electrical tools. My neighbor is a Master Electrician and he uses many Klein brand tools. Compared to my old, cheap device, the Klein Tools instrument has better sensitivity and accuracy. The visual notification is plenty bright for dark rooms where the panel box can be found. This unit allows me to quickly and easily locate circuit breakers. I don't always find them on the first try, but it sure beats pure trial and error. I already had a cheap dedicated voltage tester, but the transmitter with this Klein set also detects voltage and proper wiring of outlets! Best of all, this set fit perfectly into the hard case I already had. Also, Amazon sells good hard cases that will fit this device well.

The ET310 looks compact and clean, easy to spot in my tool bag. Features are exactly what I need: it finds the right breaker quickly, and the built-in GFCI outlet tester means I don’t need a second tool. Build quality feels solid—nothing flimsy—and it worked reliably on the first try. It’s very simple to use, even if you’re not a pro; the lights and tone make it clear when you’ve got the right breaker. For the price, it’s a great value and an easy recommendation for homeowners and DIY jobs.

Hands down one of the most useful tools I own. Finds circuits fast and accurately, even in tricky setups. Saves a ton of time on the job. Highly recommend for electricians. Solid and great quality.

I spent almost an hour trying to decipher the scrawl on the label in the breaker box to determine which might be the one to the socket that I wanted to replace. Almost all of them said: sockets/lights Thanks. So much ... I then spent half an hour flipping off likely candidates. Nope. Came to Amazon and spent some time trying to decide between this Klein device or the similar Fluke one. This seemed to have a lower proportion of bad reviews, and I do have other Klein tools which I am relatively happy with. Ordered it for same day delivery. Of course, it was "end of day" delivery, but still ... plugged in the transmitter and had the breaker located five minutes later. Next morning I swapped the faulty socket. I verified the power was off with the included voltage detector, after testing it against several sockets and light switches to be sure it worked ok. The only reason I have knocked off one star from an otherise five star review if for the cheap and nasty plastic these are made of. Plastic is ok, but this is the sort of plastic you associate with free gifts in packets of cornflakes. And these were anything but cheap.

Works as advertised. Very handy for determing what circuit breaker is connected to your outlets. High quality product. The case is also nice.

Makes finding the correct breaker much easier and safer. Real time saver. Well built, accurate, easy to read and use

GREAT VALUE! it is being added to my boyfriends tool bag for work. He's a home inspector and this allows him to offer additional services to clients and replaces some of the items he already has. Super happy about the quality, features and size!

This tool worked exactly as advertised. Before I purchased this, I spent almost two hours trying to find the right breaker in several sub panels unsuccessfully. With this I was able to find the correct breaker within 5 minutes. I've had nothing but positive experiences with Klein Tools. They are much more affordable than other brands and perform great for my needs.