I have an Amprobe AT 2005 that I've had for years. I use it as a breaker finder more than anything, I think I've only traced wires behind sheetrock walls maybe 3 times with it. But, just the other day I needed to trace an open neutral and it worked well. The problem is, I trace so little that I have to read the instruction book every time I do it so I can't say I've got any tricks or learned to get a "feel" for tracing. I simply follow the instructions, by clipping my alligator clip onto the wire and grounding the adjacent wires in the romex and then following the signal up the wall through sheetrock. I had the sensitivity turned down on the receiver so it was reading the cable only when I was within a few inches of the wall. I swept the wall back and forth tracking the direction of the cable until it seemed the signal died no matter which way I went. Turns out there was a free air splice with a loose connection behind a fake "heating vent louver" simply used to cover a big hole in the sheetrock.
If those splices weren't behind that louver, and instead were buried behind sheetrock such that I'd have to pinpoint right where the open was and cut sheetrock, I bet this tracer could do it. I haven't needed it for pinpoint accuracy like that yet, but I bet if I spent some time with it, I'd probably be comfortable enough to cut sheetrock and know I was in the neighborhood of the splice without making a bunch of practice holes.:angel: