Hi there I found this in an old printer.. I know that it counts every little line on the transparent disc, but what is it called, and does anyone know where i can read about how to use it?? Thanks in advance Mads

Quick component question

Coding_Badly January 21, 2011, 6:05pm 2

Can't tell. The pop-up ads kept getting in the way when I try to zoom in.

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