Vegas has a lot of that type of crap going on and contractors sign on the dotted lines like the FOOLS they are..
That is what null testing is for.. TOUGH difficult cabling that CAN'T be pulled out and repaired. Normally those very special cables are 100k plus and have several spare wires in the loom. As repairmen we would swap wires and move on, NEVER having to null test until the next time an issue comes up.. It told us one thing.. the cable was cut or smeared into another wire.
It's a trouble shooting tool more than anything in cabling, it will tell NOTHING of the cables voiced character ONLY if it literally has a leak, for a lack of a better term..
A mighty fancy tool for stereo cowboys and cable checking.. Crack me up.. Like anything in a stereo system deserves a null test.. Expensive yes, complicated NO...
They do have a valid point. a much different approach than the naysayer crowd like Nathen Winters and his trusty sidekicks comparing cables..
Broken record.. Oh Oh he will say that is inferior too, vinyl and RtR..
Thanks OP, folks are finally showing the "NO IT DOSN'T WORK" crowd they are just full of it and I don't mean useful information..
Regards