Klein Tools ET310 AC Circuit Breaker Finder, Electric and Voltage Tester with Integrated GFCI Outlet Tester
4.7 | 24,858 ratings
Price: 44.97
Last update: 01-29-2026
About this item
- 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
Top reviews from the United States
- BryanAccurateHands down one of the most useful tools I own. Finds circuits fast and accurately, even in tricky setups. Saves a ton of time on the job. Highly recommend for electricians. Solid and great quality.
- JD HansonSimple, Solid, and Well-Priced Breaker FinderThe 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.
- Ronald PeckGood AC Circuit Breaker FinderWorks as advertised. Very handy for determing what circuit breaker is connected to your outlets. High quality product. The case is also nice.
- Jessica StaceyA good circuit locatorThis 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
- Cody S.Works Great!This tool worked exactly as advertised. Before I purchased this, I spent almost two hours trying to find the right breaker in several sub panels unsuccessfully. With this I was able to find the correct breaker within 5 minutes. I've had nothing but positive experiences with Klein Tools. They are much more affordable than other brands and perform great for my needs.
- dhanksVery Useful ToolVery cool tool. Now I can figure out which electric sockets are connected to which breaker with confidence. Easy to use, easy to learn. Highly recommend.
- Greg MullerAnother great Klein tool.Klein makes great tools. This works exactly as advertised. Little pricey but it’s worth it.
- JoezHandy Tool for Solo Electrical WorkWorks 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.