Outside Spring Calipers (0179)
Info
Thinkness gauge in millimteres with scale ranging fom 0 to 15mm in 1/10 increments. The gauge is steel while the scale is brass.
Contrary to the most spring calipers encountered, this one has more rounded beeks.
There are no markings on the instrument, except for a logo of a circle with a horizontal arrow and a vertical line through the center.
Presumably most used by jewelers?