Klein Tools ET450 Advanced Circuit Breaker Finder and Wire Tracer Kit for Energized and Non-Energized Breakers, Fuses, and Wires

Works better than I expected for tracing wires through walls, floors, and even under a gravel drive. Following the instructions, I connected the ground lead of the transmitter to a good and certain ground; the one I used was several feet away from the unpowered type NM cable I wanted to trace. The transmitter red lead was clipped to one of the NM wires. The receiver traced the cable down the wall, underneath the floor for 50 feet, then up the wall to a junction box. It was necessary to adjust the sensitivity along the way, and I found it best to watch the numbers for best accuracy.The best thing was using the Klein ET450 the next day to trace an underground communication cable from a basement to an outbuilding about 60 feet away; we estimate that it is buried about 2 feet down. I was not expecting the ET450 to work, but wanted to give it a go. The same procedure was followed by connecting the transmitter to a solid ground a few feet away from the cable, and clipping the red lead to one of the wires in the bundle. Going outside with the receiver, it picked up the signal at a medium high sensitivity setting. Watching the numbers I could find the peak signal location within just a couple of inches and mark that. The whole path was traced to the outbuilding.The sound indication is good for giving a general indication of the wire you are locating, and the sensitivity level is necessary to be adjusted to narrow down the location to a few feet. Watching the numbers on the display will let you see very fine level changes to localize to a few inches.

This is a great tool!! intuitive setup and use. sensitivity adjustments work well for determining general direction and pinpointing location. the only thing that is different is that some on the batteries in the transmitter are mounted in the case and some are in the cover, which is less than obvious. read the instruction completely to determine how many batteries are needed.

It makes tracking wire easy. Comes with everything you need, even batteries, to find out where a mystery wire goes.

Fine device but was more than I needed. The electrician that I hired to find the fault in a circuit could have use it since his traditional guessing routine was a total failure and waste of money.

I like the sensitivity control and so far it works wellNot sure how it works underground, but it traces romex in the wall very well.

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Worked great - used it to trace a hot outlet back to the breaker panel, and had to turn the sensitivity down on the probe to narrow down the exact breaker, so it had more than enough signal on a short (maybe 75 foot) run in conduit. Tried it on unpowered data wires to label the other end of the correct cable. Worked great so far, but haven't tried using to trace any power wiring underground yet. Very nice to have one tool that works for both finding un-powered data/signal/phone pairs, as well as plugging it right into powered outlets to find a breaker before even starting. The non-contact voltage sensing in the probe seems to work about as sensitive as my much smaller Fluke Volt-Alert pens do, but I've only tested this Klein probe on 120 VAC, not any lower voltage DC cabling yet where the Fluke pens still work. Very nice case to keep it all together and un-damaged in the tool bag or box, and I really like that they provided specific holders to put the batteries into, so you don't have to store them in the device or leave them rolling around the box, so they won't run down and leak if this doesn't get put into use for some period of time.I didn't need a lot of time in the manual, just checking over features and basic usage, and the buttons and screen display are fairly intuitive. You won't need to refer to the manual much again, but it's nice that it has a place inside the box for other users. If you're tracing underground wires, you only need to pay attention to finding a neutral or ground wire that's on a different circuit somewhere else before starting. If not, the signal path going both directions on a pair that are right next to each other are equal and opposite, and tend to cancel the signal strength enough that you may not find it. No problem with simple breaker locations though, and you can use the provided adapter to just plug the transmitter right into a standard outlet.On the down side, I really dislike that they required a screwdriver to open the battery covers. That's just lazy design, and more prone to breakage, stripping, or screw loss than a decent spring clip just built right into the battery cover. And they made a VERY strange decision on the larger transmit unit, where all but two of the batteries snap into the removable battery holder that you screw back down onto the device - but then 2 more batteries need to be snapped into slots back inside the unit before you put the battery cover back on. Very uncommon, and easily missed by someone who will come back and tell you it doesn't work, and you need to remember to ask if they had 2 extra batteries left over after putting them all in. If so, reopen the transmitter, and look for the extra 2 battery slots NOT near any of the rest of the batteries.All in all, a decent unit for the price, and it does double duty on hot and unpowered wires. I've paid more for just single use units. Definitely something worth adding to your tool set, that you'll find many uses for.

Great tool,, uses it all the time. Works great and a good tool for any electrian