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Extended holiday returns
FREE refund/replacement until Jan 31, 2027 Learn more
FREE refund/replacement until Jan 31, 2027 Learn more
This item's return window has been extended for the holiday season: FREE refund/replacement until Jan 31, 2027
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
To initiate a return, please visit our Returns Center.
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Availability:
In Stock.
Arrives
Sunday, Nov 15
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At a glance
- Condition
- New
- Color
- Circuit Breaker Finder
- Model
- ET310
- Dimensions
- 10.96 x 2.16 x 1.39 in
- Weight
- 7.2 oz
- Power Source
- Battery Powered
- Style
- GFCI Outlet Tester
- In the box
- Digital Circuit Breaker FinderGFCI Outlet Tester
- Warranty
- See Manufacturer Website
- Works with
- Any electrical circuit or outlet within 90-120V AC range
Features 5
- 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
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.
Specs 21
| Brand | KLEIN TOOLS |
|---|---|
| Power Source | Battery Powered |
| Style | GFCI Outlet Tester |
| Color | Circuit Breaker Finder |
| Item Weight | 7.2 ounces |
| Minimum Operating Voltage | 90 volts |
| Upper Temperature Rating | 60 °C |
| Measurement Type | Voltmeter and Ohmmeter |
| Maximum Operating Voltage | 120 volts |
| Style Name | GFCI Outlet Tester |
| Item Dimensions | 10.96 x 2.16 x 1.39 inches |
| Brand Name | KLEIN TOOLS |
| Model | ET310 |
| Unit Count | 1 Count |
| UPC | 092644692406 |
| Number of Items | 1 |
| Item Highlight | Electric and Voltage Tester with Integrated GFCI Outlet Tester |
| Manufacturer | Klein Tools |
| Global Trade Identification Number | 06 |
| Item Type Name | Klein Tools ET310 AC Circuit Breaker Finder with Integrated GFCI Outlet Tester |
| Part Number | ET310KLE |
No specs match.
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Sunday, Nov 15
Yes, absolutely! This item's return window has been extended for the holiday season: FREE refund/replacement until Jan 31, 2027.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Awesome product!
Color: 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.
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Reviewed in the United States on May 22, 2026 by Night Owl Photography
Valuable Tool for DIY Homeowner
Color: Circuit Breaker Finder
I ordered this tester because it seemed like something that I should have in my "tool arsenal". I tried it as soon as I got it so that I knew that it worked and so that I would know how to use it when I needed it. Circuit Breaker Finder - Worked like a charm! I plugged the "sending unit" into an outlet and then headed for the breaker panel. Using the tester I followed the directions and slowly passed it over all of the breakers once and then repeated it. As you get close to the right breaker - it will start to chirp a bit and when you are on it, you get the tone and the red light and the flashing green - can't miss it! I then flipped that breaker and went back to the outlet I was testing and it was the correct breaker. Sending Unit/Outlet Tester - This is handy in that it shows you if the outlet is wired property (and it was) and I like the GFCI tester function. I tested several of the outlets in my kitchen that should be on a GFCI circuit and when tested, did trip the GFCI outlet that was controlling them. Everything works, it was easy to use, and it makes testing and working on your home/farm wiring really easy. 5 Stars and I would buy it again for sure.
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Reviewed in the United States on November 2, 2024 by TreeFarmer
Nice quality, super light and works well.
Color: Circuit Breaker Finder
Excellent tool to own for electrical breaker/outlet diagnosis. It's safe to operate, easy to use, and compatible for 115vac outlets only. .. to include GFCI. It's small, lightweight and portable. 2 thumbs up on this deal.
Reviewed in the United States on October 4, 2026 by Firecapt45
Accurate on Simple Circuits, But Cross‑Talk Causes False Positives in Complex Wiring
Color: Circuit Breaker Finder
Bought and tested the Klein ET301 AC Circuit Breaker Finder. The product arrived quickly from Amazon, was packaged well, and I had it functional within about five minutes — very easy to get started. For simple wiring layouts, it performs perfectly. However, in a home with interleaved outlet wiring, it can produce false positives. In my case, the receiver indicated the same outlet was tied to two different breakers, which is confusing and counterproductive. When that happens, you end up falling back to the old method of flipping breakers and checking for power around the house. It works, but it becomes tedious when mapping a full panel. The issue appears to come from cross‑talk on the transmitter’s imposed signal when conductors run long distances in parallel or when multiple distribution connections meet in a chase box. Under those conditions, the signal can bleed into adjacent circuits and mislead the receiver. Otherwise, this is a good product and worth trying. — HansandGret
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Reviewed in the United States on September 1, 2026 by HansandGret
Useful tool
Color: Circuit Breaker Finder
I’m not an electrician but intend to use this item in the future. Great technology at a very fair price from an excellent company. Good job, Klein!
Reviewed in the United States on September 13, 2026 by raz
Easy to use
Color: Circuit Breaker Finder
Great item which works really well!! Located several breakers from receptacles with no pain and minimal effort. Read and follow instructions, couldn't be easier.
Reviewed in the United States on August 30, 2026 by John G.
A Must Tool for Every Homeowner! Buy Now!
Color: Circuit Breaker Finder
This tool set is simply awesome. I've done house wiring a good deal and never bothered to check circuit finder tools. Dumb. This would have saved me SO much time and trouble. Wive and yelling back and forth about test lamps being off or on. Or bad wiring. If you're a home owner, buy this now. Put it in your odds and ends tool kit. Put some marking tape in it too. Most of all READ THE INSTRUCTIONS!! I know, if your a guy, ya don't do dat. but the system will not work properly if you skip important processes.
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Reviewed in the United States on July 22, 2026 by R. Russell
the breaker was rewired and no one bothered to map it out
Color: Circuit Breaker Finder
the lights are bright and clear it makes it very easy to check if any thing is live. it is sensitive enough to help me determine all the plugs in my house fits well in my tool belt or tool box the pieces plug together so its hard to loose one. i am now safer doing electrical work.
Reviewed in the United States on September 20, 2026 by Jason R Lichtneckert