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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 Tuesday, Jun 23
Order within 16 hours and 39 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


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


Compatible Devices: Any electrical circuit or outlet within 90-120V AC range


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


Warranty Description: Call vendor for warranty


Manufacturer: Klein Tools


Global Trade Identification Number: 06


Part Number: ET310


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


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


Unit Count: 1.0 Count


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Tuesday, Jun 23

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 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 Reviewed in the United States on January 8, 2026 by marktrimarc
    • Excellent tool
Style: Circuit Breaker Finder
works exactly as expected! Made finding the correct circuit breaker quick and effortless. Saved me a lot of time and frustration.
Reviewed in the United States on March 29, 2026 by Niru
    • Awesome device, works better than advertised, case is extra Awesome device, works better than advertised, case is extra
Style: Circuit Breaker Finder
Review Image by 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 Reviewed in the United States on October 13, 2020 by Rolidnot
    • Helpful tool, but requires some patience for accuracy
Style: Circuit Breaker Finder
I’m giving this 4 stars because it definitely gets the job done, but it isn't always 100% accurate on the first pass. The integrated GFCI outlet tester works perfectly and is super convenient, but the breaker finder itself sometimes takes a few tries to narrow down the exact switch. It’s a huge time-saver compared to running back and forth, but you really have to follow the instructions closely and pass it over the breakers slowly to get a reliable reading. Overall, it's a solid, well-built tool that’s great for DIY home projects, even if it has a small learning curve! ... show more
Reviewed in the United States on April 19, 2026 by ANH NGUYEN
    • Works great
Style: Circuit Breaker Finder
Great tool to have .
Reviewed in the United States on May 7, 2026 by Robert C.
    • Works great!
Style: Circuit Breaker Finder
Works perfect at a great price.
Reviewed in the United States on June 4, 2026 by Paul Cisney
    • Second pass over the panel is the one to pay attention too. Tool works great!
Style: Circuit Breaker Finder
This thing works great. The first pass is for the receiver to learn the panel. The second pass is the one to pay attention to. On the first pass, there are many false positives. The instructions warn of this. READ THE INSTRUCTIONS. After scanning the whole panel, go back and scan a second time. This worked just fine to locate the breakers I needed to identify. ... show more
Reviewed in the United States on May 4, 2026 by Keith Elbe
    • Awesome product!
Style: Circuit Breaker Finder
Get one of these. This has got to be one of THE handiest household tools I've ever purchased. Our house was built in the 80s and the electrical closet is a nightmare. It's so hard to figure out what breakers to flip when we need to do something but this makes it so easy! You just plug the one end in where you want to turn off a circuit and go out to your circuit panel and use the other tool and it alerts when you go over the correct breaker. It saves so much hassle and there's no need to yell, "Is it off?" across the house. ... show more
Reviewed in the United States on May 22, 2026 by Night Owl Photography

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