I have reached a point in my life where I need to simplify and downsize. Been going through my old (antique) camera stuff to see what I might want to part with, and found this. It came to me with some camera/darkroom equipment. I have no idea what it is. Anybody got any ideas? I thought maybe some sort of hydrometer. But, in plain water, it floats with about 1/3 of the ball above the surface. Comes in a beautiful turned wooden case. Scale is hand etched 1 through 12. Then again it might not be photographic in nature at all!
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