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Cad model point confirmation

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I have been using this technique on occasion to determine if a machined parts feature is located where it should be relative to datums. I'm wondering if it is actually gives me an accurate position.
I import my model, do all the alignments and then if I have a small feature that I can only get one hit on with my 1mm probe, I pick that point on my model. I run the program and it tells me the point was located at some x,y,z distance from the cad model point. Is this a legitimate measurement or can things go seriously wrong with this methodology? Thanks in advance.
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