Best way to measure threaded holes?

[[da...]]

Hello, new guy here.

I am using a T-SCAN hawk2 with Zeiss Inspect Optical 3D.

What is the best way to measure something like the true position of a threaded hole?

Any mistakes that I should look out for?

[[Jo...]]

Hello, 

You can use thread pins with a cylinder to measure indirectly, like you can see in the image attached.
It's very used on measurements with a contact probe, and it's a possible to measure with a scanner too.

[[da...]]

I do that on my ACCURA II cmm in CALYPSO.

How do I do it on Zeiss Inspect Optical 3D?  I will be checking off of a CAD model.

In Calypso, it is easy enough to add features that aren't there hanging out in space.  Is there an similar way to add that in Optical 3D?  Does it screw with things like prealignments / best fits / surface comparisons?

I finished the online beginner courses, and nothing like this was ever mentioned.  I am completely in the dark here.