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Klein Tools ET310 AC Circuit Breaker Finder with Integrated GFCI Outlet Tester & RT250 GFCI Receptacle Tester with LCD Display, for Standard 3-Wire 120V Electrical Outlets – –

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Product 1: This circuit breaker finder can quickly and accurately locate the correct circuit breaker in a panel corresponding to the circuit to which an electrical outlet or fixture is connected Product 1: GFCI tester consists of two parts: a Transmitter connected to the electrical outlet or fixture, and a Receiver used to scan the panel to locate the correct breaker Product 1: Receiver delivers clear visual and audible indications when the correct breaker has been located Product 1: Operates on 90-120V AC circuits Product 2: LARGE CLEAR LCD READOUT on receptacle tester to instantly view results without the need to look at a chart to understand results Product 2: TEST GFCI TRIP TIME IN SECONDS to find out if the trip breaker is functioning Product 2: DETECT WIRING FAULTS of open ground, open neutral, open hot, dual open (neutral and ground), reversed hot/ground, and reversed hot/neutral Product 2: AUTO-HOLD FUNCTION is convenient for hard-to-reach outlets
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About Us

Klein Tools is committed to American Manufacturing, since 1857. For over 160 years Klein Tools has remained dedicated to professional tradesmen worldwide, with a commitment to manufacturing the world’s fine hand tools right here in America. Our mission is to provide professional tradespeople with tools and solutions that enable the high levels of performance and safety.

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Today, the Klein brand is preferred hand tool in the electrical industry, as well as one of the leading brands used in the maintenance, construction, and industrial trades. Loyalty to Klein Tools is strong due to Klein Tools’ commitment to professional tradesmen; professionals feel the difference every day. The world has come a long way since 1857. Klein has become a multi-million dollar manufacturer… yet a company still concerned about meeting professional needs – and making products to professional-quality standards.

Additional information




‎Circuit Breaker Finder + Tester

Power Source

‎Corded Electric

Item Package Quantity




Customer Reviews

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4.7 out of 5 stars

192 ratings
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4.7 out of 5 stars

Best Sellers Rank

#73,016 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement) #87 in Circuit Testers

Date First Available

December 27, 2021

15 reviews for Klein Tools ET310 AC Circuit Breaker Finder with Integrated GFCI Outlet Tester & RT250 GFCI Receptacle Tester with LCD Display, for Standard 3-Wire 120V Electrical Outlets – –

  1. Carlos german parra


    Me encanta mucho esta herramienta

  2. Eric H.

    Used yesterday

    Used yesterday , worked like a champ

  3. Amazon Customer

    Time saver!

    If you are by yourself, you are going to save yourself ALOT of steps. Very handy!

  4. Whittier Davis

    Great product

    Great transaction. Highly recommend! AAAAA+++++

  5. Amazon Customer

    Must haves for your tool bag!

    This is one of the easiest scanner I’ve ever used… simple instructions and easy to use. It’s a must have for your every day projects around the house. It takes the guess work out of your fuse box

  6. JAY

    There are a must have.

    These tools are really a must have if you are working alone on electric in your house. They have saved me HOURS of going up and down stairs trying to figure out which breaker goes to which outlet. It has also alerted me to some potential problems which I fixed which probably would have gone unnoticed otherwise.Get one.

  7. LBVennard

    New Electric Panel – Life Saver

    I had solar installed on my home and it’s part of the installation. They installed a new electric panel. After the installation, I realized that all of the labels for the breakers were incorrect. This tool allowed me to quickly and accurately find and label all of the circuits in my home. What could’ve been very long and drawn out process was easy and quick!Thank you for the great product!

  8. Elec Engineer

    Energized circuit tracer

    I used this to trace a circuit at a mid-size church built circa 1960. As you scan breakers the receiver emits a tone and blinking LED’s that increase in proportion to the tracer signal strength. I ended up chasing some false positives on mildly elevated signal strength in the first 2 panels I checked but when I finally found the correct breaker the tone was much louder and I was very sure it was the one. I also used the GFCI tester with positive results.

  9. Leroy E Salyards

    Worked great

    This is the best circuit breaker finder that I have ever used.

  10. Bjorn Larsen

    Works as described

    Works, could be made in the USA

  11. Lyndon

    Works well for home usage

    Works well to find breaker

  12. JAH

    Works pretty well.

    Works pretty well. Sometimes it doesn’t pickup the breaker that’s tied to an outlet, but still very useful.

  13. Tom

    A really good tool to find circuit breakers and test power outlets

    This Klein Tools ET310 AC Circuit Breaker Finder with Integrated GFCI Outlet Tester & RT250 GFCI tester combo tool set is really handy to ID circuit breakers and test outlets. Highly recommended.

  14. Michael Everett

    Nice set of tools for electrical troubleshooting

    Great quality tools for locating circuit breaker’s and testing GFI receptacles.

  15. Cueball318


    Saves time in finding the correct breaker to de-energize making my job easier.

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