osterchrisi:
Hello, I think the weapon of your choice would be a so called 'micrometer'Micrometer - Wikipedia
No I don't think so, resolution and precision are not enough
maybe something like this ...
http://www.keyence.com/services/download.php?file=im6000_ka.pdf&fs=IM-6000&ws=none&img=oc_cmm_lp.jpg&layout=d2d&lil_id=1309212783&lil_ly=aln-l_tfsz-20_dfsz-16&aw=gagooglekaim899063b&gclid=CLC97ta9-rQCFUFb3god9Q8AvQ
but again, the budget is ?
I think szangvil and robtillaart have the point.