I have the Milwaukee M-spector. I bought the one that uses AA's and it works fine, but I bought it thinking the M12 batteries would fit it. They don't.
I've had it a couple years now, and use it only occasionally, but it has helped a bunch in a couple situations. Most recently I used it on a leaky drain pipe in the basement, which started as a small drip and had steadily gotten worse for quite awhile. I couldn't figure out where the leak was, because the pipe was buried in concrete.
Stuck the camera down there - in and out a few times - and sure enough, a crack ran around the circumference of the pipe right where two different floors settled a bit differently. Didn't keep me from having to chip concrete, but at least I was able to keep it to a minimum.
