Ring Size Gauge (US, UK, mm scales)
thingiverse
This is a 3D-printable ring size gauge. It is used by jewellers to measure the internal diameter of a finger or toe ring. It displays two international standard scales. The numeric US scale and the alphanumeric UK scale. In addition, a third scale indicates internal ring diameter in mm. It has an included M6 diameter hole in the base, should the user wish to stand it on a rod in a vice. The user may wish to pick out the scales and divisions with a contrasting paint to aid legibility. I added some dark wax to the print I made by rubbing it into the scales. This helps legibility. I have printed this design.
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