I never knew those things had an actual job. They were always just called finger scales here and you'd buy them in "novelty tobacco" shopsYa got mine back in the eighties from my get high buddy that owned an auto parts store. Carburetor weight gage to know if your floats were saturated or had a hole in them.![]()



and since the advent of digital technology, it'z probly been about as long since they've been uzed to actually weigh anything 
ppp