Besides accumulating boat anchors (and distributing them to unwitting victims, occasionally), I've had some really interesting test equipment come through the shack. Probably the most interesting was an antique Varley bridge, used by phone companies to locate wire faults decades before TDR sets. (And with surprising accuracy, by the way). Another gem was a standard battery cell.....sort of like two Florence flasks with a glass tube running between them to generate a precise reference voltage....if you inserted the right potions into the flasks. I've had a number of nice wood cased bridges come through...as well as a Leeds n Northrop resistance decade. Also a whole set of General Radio wavemeters. I've recently become somewhat of an instrumentation nerd...doing a lot of reading on how folks did accurate measurements of ANY kind with some surprisingly crude instruments. It's also amazing what hams were able to do with NO instrumentation.....other than perhaps an RF ammeter. I never pass up anything that resembles a piece of test equipment.....I like to use the stuff in my electronics classes....makes the kiddies appreciate digital o-scopes and DMMs all the more. What's in YOUR wallet?