Man some people have all the luck, will keep an eye out for one of these too.
Seeing your photo testing the roll, I thought about the large number of nors cable we get these days coming from China. There is no way to tell if a roll was a reject without testing it like you did. I guess this unit will be just as reliable as modern day oscilloscopes, as I see a digital display, and won't need regular calibration which is extremely expensive when you let someone do it for you. I have used Textronix equipment in the past, not a cable tester though and it was great kit to have.
Thanks for sharing, but damn your shoes are dirty. Will post info and pics when I get time off the thumping units. Not very sophisticated though, but they get the job done (they look kind of like a transformer welder).