Extech CB10 AC Circuit Breaker Finder and Receptacle Tester - Professional Grade GFCI Outlet Tester for Home & Industrial Use - Pinpoint Breakers and Fuses - Includes 9V Battery and LED Indicators

I just bought this to use in my older house and it has worked great for finding the breakers and even wires in the wall! I find for the walls it can be a little hard to trace as I feel like the wires have to be within 1-1.5" deep with the sensitivity maxed out and you can loose the signal being as little as 1/4" off from the trail, but it totally works and let me trace a few wonky paths so I could figure out exactly where the wire was moving in my walls and even to a buried junction box. I also really like the manual adjustment since it lets me hone in the breaker real quick and I don't have to scan the breaker like you see with the auto-adjusting ones. I just go to the breaker on about "half" sensitivity, move fast, and when I hear the beep I just drop it to lowest immediately and find it every time. Also due to the manual aspect of it, it let me figure out that a circuit was being served by 2 breakers and tracing which wire went where within the 14/3 wire sleeve itself since I could turn the sensitivity down so low. The socket tester works well too from the few tries. Only real issue I noticed is if you have any of the circuit based dimmers that basically everyone uses now since LED lights need them for dimming, it'll also send a signal in the line that this can pick up. It's real obvious though as it beeps much faster and sounds funny compared to how the device normally works, so either just ignore it and follow the normal beeps or turn off the light, surge protector, etc. Great device and wish I had one sooner to figure out all this weird wiring and no constant breaker switching either!

This has helped me unravel the mysteries of my house wiring. You plug the transmitter end into an outlet (three prong) and go hunting for the right breaker with the sniffer. You can buy adapters to plug into light sockets and even alligator clips to attach the transmitter to bare wires if you are feeling bold. The tool has a sensitivity knob on the sniffer. This is the part that you get a feel for when using the tool. If you have the sensitivity too high, it's difficult to identify the exact right breaker within the breaker panel. The trick is to lower the sensitivity while you are sniffing until it only beeps when you hover over a single breaker. Bear in mind there is a proper orientation indicated on the end of the sniffer. Now I have one of these, I wouldn't be without it. It's really useful and as you get better with it, you can use it for tracing wires and all sorts of things to get you out of a bind. Highly recommended.

............................ understand I am not a professional electrician but I am a quality oriented handyman who specializes in simple to moderate electrical projects and I use devices like this to assist me in my completion of any particular electrical project. from what I personally understand about EXTECH is that they are not an ultra professional grade manufacturer of electrical tools and testing equipment but they are more of an upper midlevel or pro consumer grade tool and equipment manufacturing and design company. EXTECH is still a quality product for the home handyman to the everyday residential grade pro electrician but for high dollar pro grade commercial / industrial or / institutional electricians who wire high rises / schools / malls / hospitals and such this unit may be a little lacking in features or quality. if you need a higher quality grade circuit breaker tester I recommend or prefer brands like FLUKE / KLEIN / TRIPLETT / or AMPROBE .this again is just my personal opinion though so please remember that when making your final purchase decision. ............................. here are the things I like about this unit. . (thing one) it has a plug unit that tests wiring polarity issues with colored L.E.D lights. (thing two) it tests GFCI outlets with the red button on top of the plug . (THING THREE) it finds or traces breakers in your panel and matches them to the circuit that the green plug unit is connected to . ..............................these are the things I personally don't like about this device. (thing one) its iffy looking build quality especially on the sensor wand. (thing two) the fact that the green plug unit doesn't beep when plugged in unlike similar SPERRY TESTORS that I have where the plug unit beeps and has a flashing red L.E.D light on the front these features obviously are not 100 percent necessary but they do help and make a minor difference but one thing to understand is my SPERRY TESTORS do not test receptacle polarity. (thing three) the sensitivity wheel on the wand unit seems weak and doesn't seem to have an equal or effiecient adjustment range across its entre range of adjustability. in summation this is not a bad unit it gets the job done but it does have some very minor hindering issues that finicky users or ultra high end professional electricians might find lacking. .

Our panel labels are no longer accurate following a partial remodel a few years ago, and a service- and panel-upgrade last year. I need to replace an outlet without accidentally shutting down our computers, and the Extech 1218G94EA CB10 Circuit Breaker Finder made it easy to locate the right breaker without shutting anything off first. I've read the reviews of other breaker-finders and their users' difficulty pin-pointing the one correct breaker out of the several (or many) the tool identified. This tool has a sensitivity dial allowing you to manually decrease the sensitivity until it only responds to one breaker as you scan the panel. Since it does not try to adjust itself automatically, you get to tweak the sensitivity up and down until you're confident you've found the right breaker before you shut anythnig off. When you do shut off the breaker you identified, the signal disappears completely, even at full sensitivity, as a confirmation. When you go back to the outlet, the transmitter lights will be off as a second confirmation that the circuit is dead. This is a two-piece tool: A transmitter (which is also a wiring-fault tester and GFCI-protection tester) that you plug into the outlet whose breaker you need to identify; and a receiver/scanning tool that you pass over the breakers on your panel and which beeps and flashes when it finds the transmitter's signal. The transmitter comes with a cheap 9v battery which probably won't last long, and which will likely eventually leak and damage the tool. I'm using mine (hey, I had to try out my new toy!) but I'm going replace it with a high quality battery Alkaline battery very soon. I'd call this a home handyman-/handymaam-level tool for its less rugged construction than what a pro would need and expect, and it's priced to match. No stars off for that - it's the right tool for the market it serves. A pro tool would probably include adapters for a light socket and a set of jumper wires, which I didn't want or need right now. If and when I do, those are hardware store items.

Very effective tool, I use it on almost every repair call. It made me look like a pro when I labeled all the sub panels for a commercial warehousing customer of mine who berths hundreds of food trucks boats and RV's. When they need to know where a breaker is in one of their 9 panels they can find it because they are all labeled now at the receptacles. It works for two and three leg circuits without neutral legs better than I thought it would. I used alligator clip jumper wires and pins to connect the plug to the various twist lock and range receptacles that the food trucks plug into for the night. It is a little hazardous to have open hot wires using alligator clips, but it works safely and well well with a little caution and a vigilant helper. I am very happy. I have also used it to locate GFI feeds and test GFCI receptacles. It is a good tool and a great price. It is not a hard core unit in the long run, but it is not crummy cheap either. I am a professional repair contractor and although I am not destructively hard, am very hard on my gear in normal use, electrical work is a rough discipline. I drop things a lot, and I use it up, burn it out, and play it as productive as possible. I have no problem with the fact that a saws-all lasts me about a year during rough in work. The tool makes its money several times over. The plug-in on the breaker locator broke when I was testing a GFCI. The ground prong came out of the plastic body. The prongs are good thick stainless steel but it needs a larger chamfer ring to hold it into the plastic, at least the ground prong anyways. I absent minded threw both the plug and receiver away immediately on the job site with some other debris and wire clippings. I looked closely at the body of the plug and hastily decided not to try to open it and fix it. I figured I would just buy another one. Now I wish I had saved it and looked closer later. I have a entry level quality toner kit also and love it. I have dropped it twice and opened it and fixed the antenna cartridge and the speaker twice. I can not see the point in spending over 100 bucks on instruments that are gonna get beat up, or stolen anyways. This is an excellent tool whether you are a home-owner or a professional. The seller gets it out quick and with good packaging. If I am more careful with the plug I am sure it will not break again.

It worked well for nine years, until it didn't. I traced the problem down to the power switch, which is part of the sensitivity adjust knob. There's a metal arm that gets pushed away from a contact when the switch is "Off", and allowed to bear against the contact when "On". Now, when "On", the two seem to be touching, but aren't conducting electricity. Jumping the two with a screwdriver turns the unit on, but that's a PIA. I'll try some sandpaper to see if it'll fix it. Otherwise, a bit disappointing. Edit: sandpaper didn't work, as some of the switch's solder joints were bad. Fixed solder joints, and bridged switch so that the unit would be on every time I plugged in a battery. Worked, until I reassembled, when it again didn't. Threw it away. Yes, it's nine years old, but I used it perhaps a dozen times in that span, and that isn't a lot.

Works as per website, no issues.

I plugged in the sending unit, went to the breaker box with Square D breakers and immediately found the correct breaker. I have two services, with separate services to the garage and house. When testing the second service, the results were less than stellar, in fact they were not even close. Some research leads me to believe the sensor basically looks for a pulse of amperage on the service. The second box I tried uses Pushmatic breakers, which utilize a bus bar on the outside. If I ran the sensor down the outside, it picked up the signal (the amperage pulse) off the bus bar, thus every breaker on one side of the box indicated. If I ran the sensor down the center, I would have no idea whether the left or right breaker triggered the response. After thinking this through, I made two passes, the fist on the outside to determine left or right, the second down the center to find the vertical position. Perhaps some of the negative reviewers do not realize this. Initially I planned on giving a negative review based on what I thought were false triggers. However, now I understand it, I love it. It is also important how one holds the unit. There is an arrow marked "Up/Down" This line must be vertical. Otherwise, it still gives false triggers. This is in the instructions, but who reads those?

The Extech CB10 makes finding breakers fast and easy with its transmitter‑and‑receiver design. Signal strength indicators are clear, and the controls are simple — perfect for DIYers and pros alike. Build quality is solid, and it works reliably on standard North American circuits. Note: The plug may need a small modification to fit certain outlets, but it’s manageable. Overall, a great value for anyone working with electrical panels.

Testei e recomendo

あと、3p⇨2pへんかんがついていればと思いました。使い勝手は良いです

Es de menor calidad que los de estados unidos pero aún así es una excelente herramienta

Purchased kit for personal use works well for home use would stepping up to another kit if using it for work. Dislike to handheld voltage testor with the light, it has no sound just the light when it detects voltage. I have similar models with sound and lights I find them better