Search  for anything...
KLEIN TOOLS

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

  • Based on 24,578 reviews
Condition: New
Checking for the best price...
$44.97 Why this price?
Save $5.00 was $49.97

Buy Now, Pay Later

As low as $11 / mo
  • – 4-month term
  • – No impact on credit to apply
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Apple Pay, and PayTomorrow. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

FREE 30-day refund/replacement

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.

View our full returns policy here.

Availability: In Stock.
Fulfilled by Amazon
Arrives Thursday, May 7
Order within 7 hours and 3 minutes
Available payment plans shown during checkout
Protection Plan Protect Your Purchase
Checking for protection plans...

Recently Viewed

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


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: Thursday, May 7

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.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

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 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
    • Great purchase
Style: Circuit Breaker Finder
This thing is awesome. Works great. Perfect for every do-it-yourself homeowner
Reviewed in the United States on April 11, 2026 by Ramiro Guedea
    • 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
    • So easy to use and works perfectly - just watch the video
Style: Circuit Breaker Finder
Watch the video first as you need to scan all the breakers to "learn" just like it shows, but you can identify the outlet to the proper breaker in just a few seconds' time. My panel was not properly labelled and after years of trial-and-error I got this and mapped them all out. This is a tool that will last a lifetime and always be of use for the rest of your life. ... show more
Reviewed in the United States on April 1, 2026 by Rick R.
    • 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
    • works fine
Style: Circuit Breaker Finder
Good price, good product and Fast shipping
Reviewed in the United States on March 28, 2026 by eml58
    • Located Breakers
Style: Circuit Breaker Finder
Works great, allowed me to trace all of my lights and outlets to the poper breaker.
Reviewed in the United States on April 18, 2026 by BJ1845

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...