I am looking for some guidance on the best way to check perpendicularity of a B datum hole back to A datum. The material is 1.6mm thick and the only thing I can think of would be to measure the B datum at 2 or 3 different depths then construct a cylinder. Am I wrong in thinking this callout is a little silly? I'm grateful for any advice you guys can throw my way.
Is my approach to measuring it correct? 2-3 measurements at different depths then constructing a cylinder? I'm also assuming a 0.5mm or 1mm ruby would be best for this situation?