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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, Mar 27
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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


Power Source: Battery Powered


Minimum Operating Voltage: 90 Volts


Upper Temperature Rating: 60 Degrees Celsius


Measurement Type: Voltmeter and Ohmmeter


Maximum Operating Voltage: 120 Volts


Style Name: Circuit Breaker Finder


Color: Orange


Item Weight: 7.2 Ounces


Item Dimensions: 10.96 x 2.16 x 1.39 inches


Brand Name: KLEIN TOOLS


Model: ET310


UPC: 092644692406


Manufacturer: Klein Tools


Global Trade Identification Number: 06


Item Type Name: Klein Tools ET310 AC Circuit Breaker Finder with Integrated GFCI Outlet Tester


Included Components: Includes Transmitter, Receiver, user manual, and 9V battery for Receiver


Unit Count: 1.0 Count


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Friday, Mar 27

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
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
    • 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
    • A must-have for unlabeled breaker panels!
Style: Circuit Breaker Finder
Our builder left the breaker panel completely unlabeled, making simple repairs a nightmare. This Klein Tools ET310 worked perfectly to map out the whole house. The receiver is very accurate—it might beep on a few breakers during the first pass, but once it "learns" the panel on the second pass, it points directly to the right one every time. It saved me hours of running up and down the stairs or yelling across the house "Did that turn it off?" ... show more
Reviewed in the United States on February 26, 2026 by Kris Garner
    • 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
    • Professional grade and a total time-saver!
Style: 3-Piece Kit
This Klein Tools 80064 Circuit Breaker Kit is an absolute essential for anyone doing electrical work, from simple DIY projects to more complex troubleshooting. The digital circuit breaker finder is incredibly accurate—it eliminates the "guess and check" method of running back and forth to the panel. The non-contact voltage tester is a must-have for safety, providing clear visual and audible alerts, and the included zipper bag keeps everything organized and protected in my tool bag. It’s a high-quality, reliable set that pays for itself in the time and frustration it saves! ... show more
Reviewed in the United States on March 10, 2026 by Bartek
    • Effective tool
Style: Circuit Breaker Finder
Works well for mapping and testing outlets on the circuit breaker board.
Reviewed in the United States on February 21, 2026 by Linda Tax
    • Great electrical tools
Style: Circuit Breaker Finder
Klein tools work very well for home repairs. Have used these tools several times and have saved money on simple electrical repairs
Reviewed in the United States on February 6, 2026 by FMS
    • 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

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