Calibration of Angle microscope stage micrometer

greif

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I would like to get a calibration done on a protractor image on a microscope stage micrometer (1'x3' substrate). I would like very low uncertainty, so an NMI would be best. So far I have not found one that can do this; any ideas or sources?

This image has quite short legs to the angles (1mm) so doing this geometrically limits the accuracy.
 
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