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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 Thursday, Oct 9
Order within 19 hours and 53 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: Circuit Breaker Finder


Item Weight: 7.2 Ounces


Product Dimensions ‏ : ‎ 10.96 x 2.16 x 1.39 inches; 7.2 ounces


Item model number ‏ : ‎ ET310


Department ‏ : ‎ Unisex-Adult


Batteries ‏ : ‎ 1 9V batteries required. (included)


Date First Available ‏ : ‎ April 15, 2019


Manufacturer ‏ : ‎ Klein Tools


Best Sellers Rank: #1,900 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement) #2 in Circuit Testers


#2 in Circuit Testers:


Customer Reviews: 4.7 4.7 out of 5 stars 24,379 ratings


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Thursday, Oct 9

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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Leasing options through Acima may also be available during checkout.

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Similar Products

Top Amazon Reviews

    • The Klein ET310 Is My Go Too!
Style: Circuit Breaker Finder
The Klein ET310 Circuit Breaker Finder is a great tool to help in locating the right circuit breaker. I plan to use around my home and help my friends to locate the right circuit breaker. I used it today, and it easy to use and found my breaker quickly. It is a time saver and it will help you get the job done. I like the light weight design and the transmitter doubles as a circuit tester to ensure that your wiring is correct. It is designed very well and light weight and has an intuitive instruction manual. This is a great device and I highly recommend it! ... show more
Reviewed in the United States on March 22, 2025 by Chuck B.
    • No More Guessing Games with Live Wires (Or Near-Death Experiences)
Style: 3-Piece Kit
Before this kit, my method for finding the right breaker was pure chaos: flip one, yell “DID IT TURN OFF?!” and hope I didn’t just blackout the fridge or zap myself into early retirement. Enter this glorious Klein Tools kit—a 3-piece safety squad that has officially ended my days of blind wire surgery. The breaker finder? Pinpoint accurate. The non-contact voltage tester? Like a Jedi lightsaber for electricity. And the zipper bag? Keeps me feeling organized even when I have no clue what I'm doing. Now, instead of gambling with my life and household appliances, I can confidently shut off the right breaker like a real professional—or at least look like one. Klein Tools, thanks for saving my circuits… and probably my eyebrows. 10/10, would recommend to any fellow weekend warrior tired of playing “Will I Get Shocked Today?” ... show more
Reviewed in the United States on July 6, 2025 by Long
    • Awesome device, works better than advertised, case is extra
Style: Circuit Breaker Finder
Review Image by Rolidnot Rolidnot
I have used this device extensively and I have found that it works extraordinarily well on newer wiring (Romex). I bought this tester in December of 2019 and it's worked great since that time. I use it weekly and once you get a "feel" for it, the tester works well. You have to be a lunkhead not to get this work. My home was built in 1992 and over time, the cheap, builder grade switches and outlets have begun to fail. I've changed the old ones out with new Lutron versions. I've found that about 50% of the labels on my panels box were wrong or incomplete. This tester has made the process of locating the proper breakers and swapping out the old/new switches and outlets foolproof and simple. It allows me to properly label my panel box as well. The full kit contains the following (case is extra): - Probe - Transmitter - GFCI tester - 3 prong to 2 prong plug converter - Light bulb connection - Bare wire connector - case is extra - multiple versions are available on Amazon Pro: -Simple to use. Plug the tester into the desired circuit outlet or bulb (adapter for bulbs included), it lights up to show power to the circuit and has a GFCI tester as well. Power up the location wand and slowly move it over the breakers and it glows and beeps continuously. -You get a sense for when you are on the right circuit with experience and the "wand" lets you know. Yes, if you hold the wand over the main power breaker, it will tell you it's powered breaker because technically it is - but you'll turn off the entire house with that breaker. -Small, lightweight, reasonably priced, the full kit is versatile Con: -I have not used this tester on old knob and tube two wire circuits - they may present an issue but I'm not sure. - Case is extra - it needs a case for the larger kit Overall, this is terrific circuit locator/tester. I just used it prior to writing this review to locate a 20-amp garage outlet circuit with a GFCI that was labeled "appliance" on the panel box. Electricians..... I have NO idea why some "professional" electricians are so lazy about properly marking circuits - use a label maker and do it right. I'm not a licensed electrician but I know "lazy" when I see it. Hope that helps! From my experience, this is a great acquisition. Hope that helps. ... show more
Reviewed in the United States on October 13, 2020 by Rolidnot Rolidnot
    • Versatile AC Circuit Breaker Finder
Style: Circuit Breaker Finder
I recently purchased the AC Circuit Breaker Finder with an integrated GFCI Outlet Tester, and it has proven to be an invaluable tool for my electrical projects. This versatile device has streamlined my workflow and significantly improved the accuracy and efficiency of my electrical work. The circuit breaker finder is incredibly user-friendly, allowing me to quickly and accurately locate the corresponding breaker for any electrical circuit within my home. This has saved me considerable time and effort, as I no longer need to manually test each breaker to identify the correct one. Additionally, the built-in GFCI Outlet Tester is a fantastic feature that enhances the functionality of this tool. With this integrated tester, I can effortlessly check the wiring and safety of my GFCI outlets, ensuring they are properly installed and functioning as intended. This has given me peace of mind, knowing that my home's electrical system is up to code and operating safely. In summary, the AC Circuit Breaker Finder with Integrated GFCI Outlet Tester is an essential tool for any homeowner or professional electrician. Its ease of use, accuracy, and versatile features have made it a must-have addition to my toolkit, and I highly recommend it to anyone in need of an efficient and reliable electrical testing solution. ... show more
Reviewed in the United States on April 4, 2023 by Cris G
    • Works perfectly and is very accurate
Style: Circuit Breaker Finder
Easy to use, solid build, and reliable for testing outlets. Highly recommended.
Reviewed in the United States on August 22, 2025 by Xavier Hernandez
    • Excellent Tool For Identifying Circuit Breakers
Style: Circuit Breaker Finder
Another fine tool from the folks at Klein Tools. It does the job of locating circuit breakers in a house without fail. Easy to use, well-made, and a high quality tool for any DIY Homeowner.
Reviewed in the United States on September 10, 2025 by JL in Virginia
    • Very Handy
Style: Circuit Breaker Finder
This product worked as described and makes it much easier to determine which breaker on outlet or light is on. Several friends love it too.
Reviewed in the United States on August 21, 2025 by Chief
    • Tool has to "Learn" the panel. The operator has to "learn" the tool.
Style: Circuit Breaker Finder
Tool has to "Learn" the panel. The operator has to "learn" the tool. The first time I used the tool I was disappointed. I scanned all the breakers to learn the panel by DRAGGING the receiver tip across each breaker without lifting the receiver tip off the breakers. When I went back to find the correct breaker, 2 or 3 breakers would indicate as the correct breaker for the circuit under test. Then I said to myself "self you must be doing something wrong". This time to scan all the breakers to learn the panel, I touched each individual breaker, the pulled the receiver back a couple inches then went to the next breaker. The tool worked perfect after using that procedure. ... show more
Reviewed in the United States on September 3, 2025 by Amazon Customer

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