When I was working, we had a professional version of one those (about $200). Could never get it to work on live electrical power circuits, even though the tone generator was an AC plug.
Regarding the HF version, one reviewing said "Does not detect signal more than a few inches away."
That was my experience with the pro version. The HF tone generator won't work on live AC circuits.
BTW, the Cen-Tech unit is almost identical to the Extech TG20.
Extech is pretty good quality.
Found this; good explanation on how to use it (scroll down).
We ranked 5 of the best tone and probe tracing kits. They provide exceptional tracing capabilities for a variety of low-voltage scenarios.
www.top5reviewed.com
After listening to the video, he said a tone generator is different from a circuit tracer, which is confusing because a tone generator is a circuit tracer.
This is going to be difficult, if not impossible, to find a short circuit in a cable bundle.
If it doesn't work, then....
I think this is a better tool for this application because it has an automatic resettable circuit breaker.
Use to locate shorts quickly and inexpensively in 12 volt automotive circuits.Eliminates need to remove upholstery and floor coverings.Operates through metal parts, panels, fiber and plastic materials.Connect leads to post of blown fuse then use induction type needle indicator to pinpoint...
www.toolaid.com