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KLEIN TOOLS

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

  • Based on 24,538 reviews
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Availability: In Stock.
Fulfilled by Amazon
Arrives Tuesday, Nov 25
Order within 16 hours and 5 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. Circuit Breaker Finder locates the correct breaker in a panel. Tester consists of two parts: a Transmitter and a Receiver. GFCI Outlet Tester integrated in receiver. Transmitter docks in the Receiver for convenient storage as a single item when tester is not is use. Transmitter incorporates a three-pin plug for connecting to North- American-style grounded electrical outlets. The transmitter may be connected to other electrical fixtures using optional accessories which are sold separately (Cat. No. 69411). Receiver powers off automatically after approximately three minutes of non-use to conserve battery life. Transmitter is powered by the circuit when connected to the electrical outlet or fixture. Low battery indicator. Easily accessible battery compartment. Uses one 9V battery in receiver only; Transmitter does not require a battery. Built to withstand a 6.6-Foot (2 m) drop. CAT II 120V safety rating. Measurement Category II is applicable to test and measuring circuits connected directly to utilization points (socket outlets and similar points) of the low-voltage MAINS installation. Includes Transmitter, Receiver, user manual, and 9V battery (for Receiver). 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


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: #1,474 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement) #3 in Circuit Testers


#3 in Circuit Testers:


Customer Reviews: 4.7 4.7 out of 5 stars 24,538 ratings


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Tuesday, Nov 25

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

    • 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 JD Hanson
    • 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.
    • Another great Klein tool.
Style: Circuit Breaker Finder
Klein makes great tools. This works exactly as advertised. Little pricey but it’s worth it.
Reviewed in the United States on October 9, 2025 by Greg Muller
    • A good circuit locator
Style: Circuit Breaker Finder
This is a good tool to find a breaker that needs to located, in a panel box, simple to use, plug the transmitter in the outlet, ( if you purchased the accessory bundle, it will include a lamp bulb to outlet adapter, and a set of alligator clips to outlet, for raw wire connections ) the transmitter also functions as an indicator when the circuit is energized ( tally lights illuminate ), and it will indicate how the outlet is wired, ( reversed polarity, missing ground,etc. ), then you turn on the detector, and go to the fuse/breaker panel box/board, then you start at the top of the row of breakers and slowly drag the device down, on each bank of breakers, the unit will buzz/light-up, somewhat randomly, you do this ,so the device can "learn the panel-board", then do a second sweep of the breakers, and it will locate the circuit that the transmitter is connector to, works pretty well, like 85-90 percent of the time, if you have sub-panels, it will only show the breaker for the sub-panel, you will have to repeat the sweep method, on the sub-panel it self, and you will have to turn off the sweep device and re start the process on the sub panel to find the breaker/circuit, try to use fresh batteries, year old batteries will give so,so results, I date stamp my batteries when inserting, so there no question as to how old they are ... show more
Reviewed in the United States on February 10, 2023 by Jessica Stacey
    • Klein Tools ET310 AC Circuit Breaker Finder, Electric and Voltage Tester with Integrated GFCI
Style: Circuit Breaker Finder
Awesome tools that I use all the time with work they work as described and well worth the money spent Thank you!
Reviewed in the United States on October 2, 2025 by Randy B
    • Handy Tool for Solo Electrical Work
Style: Circuit Breaker Finder
Works great, made it easy to identify the circuit I needed to work on without multiple trips up and down the stairs, checking if I turned off the correct breaker.
Reviewed in the United States on October 18, 2025 by Joez
    • Love this thing.
Style: Circuit Breaker Finder
Really a wonderful tool. Saw it demo'd on YouTube, and thought it might actually help me identify all of the circuits in my house. And it did. It's not perfect by any means, but dang.....it really makes the job easier. I now have room-by-room illustrations for the next time I work on the house.
Reviewed in the United States on October 7, 2025 by BrodyA
    • Works well READ capability carefully.
Style: Circuit Breaker Finder
This product works great and with the additional connection kit very versatile. I did not realize that this will not work on non-powered lines in order to track a broken line. Need an battery powered tone generator for that.
Reviewed in the United States on November 4, 2025 by Nomad

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