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KLEIN TOOLS

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

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Availability: In Stock.
Fulfilled by Amazon
Arrives Friday, Feb 6
Order within 23 hours and 37 minutes
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Style: Circuit Breaker Finder


Features

  • ACCURATE CIRCUIT BREAKER IDENTIFICATION: Quickly locate the correct breaker with precision using our circuit breaker finder, ensuring efficient electrical troubleshooting
  • TWO-PART SYSTEM: Consists of a Transmitter connected to the outlet/fixture and a Receiver to scan the panel, allowing for easy and accurate breaker identification
  • CLEAR INDICATIONS: The Receiver provides visual and audible cues when the correct breaker is found, ensuring a hassle-free locating process
  • WIDE COMPATIBILITY: Operates on 90-120V AC circuits, making it suitable for a variety of electrical systems and installations
  • BUILT-IN GFCI TESTER: The Transmitter includes a GFCI outlet tester, enabling you to inspect wiring conditions and test GFCI devices for added safety
  • CONVENIENT STORAGE: The Transmitter docks in the Receiver, offering a compact storage solution, keeping the components together when not in use
  • UNIVERSAL CONNECTIVITY: The Transmitter features a three-pin plug for easy connection to North-American-style grounded electrical outlets, ensuring seamless compatibility

Description

The Klein Tools ET310 Circuit Breaker Finder with Integrated GFCI Outlet Tester is a digital circuit breaker finder used to locate the correct circuit breaker in a panel to which an electrical outlet or fixture is connected. The Transmitter is connected to the electrical outlet or fixture in the circuit while the receiver is used to scan the breakers in the circuit panel. The Transmitter also features a GFCI outlet tester. For more than 160 years, Klein Tools has manufactured premium-quality, professional-grade hand tools that deliver the performance, durability and precision needed to get the job done right. Our family of engineers, workers and craftsman continue to put six generations of expertise into every tool we create by using only the highest quality materials, superior workmanship, and keeping manufacturing as close to home as we can. Klein isn't just the name of our company, it's also our family name. And since we're an American company that's family-owned and family-run, you know you can count on us to be here tomorrow. Klein Tools doesn't just make great products, we make great products that stand up to the demands of the professionals who use them every day ... Since 1857.

Brand: KLEIN TOOLS


Power Source: Battery Powered


Style: Circuit Breaker Finder


Color: Orange


Item Weight: 7.2 Ounces


Brand: ‎KLEIN TOOLS


Power Source: ‎Battery Powered


Style: ‎Circuit Breaker Finder


Color: ‎Orange


Item Weight: ‎7.2 Ounces


Item dimensions L x W x H: ‎10.96 x 2.16 x 1.39 inches


Min. Operating Voltage: ‎90 Volts


Upper Temperature Rating: ‎60 Degrees Celsius


Measurement Type: ‎Voltmeter and Ohmmeter


Maximum Operating Voltage: ‎120 Volts


UPC: ‎092644692406


Manufacturer: ‎Klein Tools


Global Trade Identification Number: ‎06


Product Dimensions: ‎10.96 x 2.16 x 1.39 inches


Item Weight: ‎7.2 ounces


Department: ‎Unisex-Adult


Item model number: ‎ET310


Batteries: ‎1 9V batteries required. (included)


Date First Available: ‎April 15, 2019


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Friday, Feb 6

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Similar Products

Top Amazon Reviews

    • Trusted Klein Tools Brand, Easy To Use
Style: Circuit Breaker Finder
Review Image by marktrimarc marktrimarc
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. ... show more
Reviewed in the United States on January 8, 2026 by marktrimarc marktrimarc
    • Simple, Solid, and Well-Priced Breaker Finder
Style: Circuit Breaker Finder
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. ... show more
Reviewed in the United States on November 1, 2025 by Jimmy
    • Accurate
Style: Circuit Breaker Finder
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.
Reviewed in the United States on November 20, 2025 by Bryan
    • Works well.
Style: 3-Piece Kit
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. ... show more
Reviewed in the United States on January 5, 2026 by PJP
    • Good AC Circuit Breaker Finder
Style: 3-Piece Kit
Works as advertised. Very handy for determing what circuit breaker is connected to your outlets. High quality product. The case is also nice.
Reviewed in the United States on December 6, 2025 by Ronald Peck
    • Excellent Tracking Fuse Tool
Style: Circuit Breaker Finder
Works extremely well for tracing down the fuse to the room. Easy to set up and straight forward function. The voltage appears to work with any standard home panel but I had a few instances where I got a few false alarms. The unit requires running up and down all the fuses twice to pin point an exact near identical signal match. I would say it is durable and the design is modern. Can fit in any work bag or pocket. ... show more
Reviewed in the United States on January 26, 2026 by Joni
    • practical - perfect for the handy-man!
Style: Circuit Breaker Finder
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!
Reviewed in the United States on December 3, 2025 by Krissy Lynch - REALTOR
    • Klein circuit locator
Style: Circuit Breaker Finder
I bought one for myself and two others for gifts, works great, makes finding the correct circuit a breeze if your breakers aren't labeled or labeled correctly, it is very easy to use, make sure to follow all safety precautions when working with electricity
Reviewed in the United States on January 25, 2026 by Michael D.

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