Basically, it will detect any open circuit or short circuit in a car's wiring, WITHOUT having to rip trim panels apart. It does much the same as a time domain reflectometer but uses a different method to induce a signal in any car circuit and then detect that signal using a special receiver, allowing you to detect an unwanted short or open circuit to within inches.
In my view a truly amazing piece of kit, and specifically designed with all the extras to make fault-finding on a car as simple as possible.
As with all my kit it is complete and in perfect condition
http://www.mobilecentre.co.uk/power-probe-smart-ect2000-short-circuit-finder-ect-2000-new-p-440.html
http://powerprobe.com/powerprobe/Home.html
If you search Youtube for "ECT2000", there are a few videos showing how effective and versatile it is.
I'm looking for £110 to include courier delivery.