Gday Bojan
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Electronic caliper with 0.05mm costs around $50 or so. And it has RS232 (interface must be added though but I think this is just low-voltage RS232 level converter)
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Most of the cheap calipers with RS232 out use a funny Chinese protocol and arent "simple" RS232 at set bauds ( which is a pain ) ie
http://www.shumatech.com/support/chinese_scales.htm
I have hacked into a std vernier caliper, and can read it with my PC via a parallel port logic analyser, but its not real practical for a focusser. A dial unit with RS232 out may be the go if it uses the same protocols.
Andrew