⚡ Find the breaker before your coffee cools — precision meets power!
The Klein Tools ET310 is a battery-powered, two-part circuit breaker finder designed for North American 90-120V AC systems. Featuring a transmitter that plugs into outlets and a receiver that scans panels, it provides clear visual and audible signals to identify breakers quickly. It also includes an integrated GFCI outlet tester for enhanced safety checks, all housed in a compact, dockable design for professional convenience.
| Brand | Klein Tools |
| Power Source | Battery Powered |
| Style | Circuit Breaker Finder |
| Color | Circuit Breaker Finder |
| Item Weight | 7.2 Ounces |
| Item dimensions L x W x H | 10.96 x 2.16 x 1.39 inches |
| Min. Operating Voltage | 90 Volts |
| Maximum Operating Voltage | 120 Volts |
| UPC | 092644692406 |
| Manufacturer | Klein Tools |
| Global Trade Identification Number | 00092644692406 |
| Part Number | ET310 |
| Item Weight | 7.2 ounces |
| Product Dimensions | 10.96 x 2.16 x 1.39 inches |
| Country of Origin | China |
| Item model number | ET310 |
| Batteries | 1 9V batteries required. (included) |
| Material | PC & PC-ABS housing and electronic components |
| Pattern | Breaker Kit |
| Voltage | 120 Volts |
| Item Package Quantity | 1 |
| Special Features | Transmitter docks in Receiver Transmitter integrated GFCI outlet tester in receiver |
| Included Components | Includes Transmitter, Receiver, user manual, and 9V battery for Receiver |
| Batteries Included? | Yes |
| Batteries Required? | No |
S**E
Every home owner needs this to determine which outlet goes to which breaker
I've used this for about 6 months on and off while remodeling a home. It works great for detecting which outlet goes to which breaker. I like how it gives information about whether the outlet was wired correctly and whether it has proper ground or not. This is definitely needed to go along with a multimeter. If only I had found out about this sooner. With this, I found that the outlet wiring were reverse. The black hot wire goes on the shiny gold screw and the white neutral wire goes to the regular dull color screw on the side of the outlet.
S**S
Electric line tracer
I'm not an electrician, but I have to play one in my house. Electricians $$. I also live in a 1940s home, remodeled more than once before and since myself. That means mysterious electric wiring all over. So I needed this badly. Klein is one of the quality devices in line testing, and this one is up to par. It accurately reveals where a outlet leads to which circuit at your electric panel.works well, and accurately almost too sensitive so check nearby circuits several times and settle on the one by flipping that switch and then the outlet then without power. It looks a bit long, but that's because the two parts are meant to when not used. I.e., you don't lose one part.
T**M
Works quite well
After reading the negative reviews on some of these I was concerned, but this one works well. Depending on how wires are arranged in a breaker box, it can be off a little, but it will get you really close. Sure is better than turning breakers off one at a time.
B**C
Easy to use and helpful if used as inteded
Helpful quick scan/ diagnostic tool but that is all. If you rely on this you will run in beeping circles all day long. Used correctly and its definitely nice to have
G**5
Recommended
This is a game changer for DIY'ers like myself. With my panel in the basement missing a lot of labels it makes finding the right breaker a snap. Great investment.
M**K
Easy to use.
Great for any wiring project. Easy to use. Definitely makes me feel safer when doing those wiring projects.
J**Y
Works with no issues
I use this on my house and at work. I haven't had any issues yet and would buy again if need be.
M**G
Ease of use
Great for identifying circuits and easy to use.
Trustpilot
2 weeks ago
1 month ago
