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Thank you very helpful.Looks like a depth gauge, but perhaps broken.
Thank you for answers. I had no clue. Maybe that's why it was in the bottom of a bottom drawer!An old first generation depth gauge.
Should be reading zero on surface, so probably broken.
You could try to sell it on EBay to a collector. It's probably only worth $10 or 20 broken.
Thank You!Looks like a depth gauge, but perhaps broken.