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Small area to measure perpendicularity.

Greetings colleagues. Gradually I am convinced that the simpler the detail, the more difficult it is to measure it.
Now I am working on measuring a cylinder 10mm high and 6mm in diameter, there is a requirement that both sides are perpendicular to the cylinder itself, which is the base A.
I can't find a suitable measurement strategy. In addition, the area of the sides of the cylinder is very small, and I have very poor repeatability.
Maybe you can give a couple of recommendations?