Cable Comparator

I think this is what you remember. Here's an article on the original comparator and its inventor, David Salz, of Straightwire and Wireworld.

http://www.gspr.com/wireworld/_ww_bkgnd_fr.html

Brushro - to answer your question - the Cable Comparitor was made by David Salz at Wireworld cables (www.wireworldcable.com). I doubt that they are still available as it was quite a while ago, but IF one can be gotten, David Salz would know how to go about it.

Check this out-http://www.manleylabs.com/containerpages/skipjack.html