Hi,
Cannot really answer your question, but I would suggest to buy a stepmotor with a rotary encoder attached instead, assuming you're looking for an encoder.
It's easier to find than just the encoder and you can pay as low as 15$ + shipping for it on e-Bay. Certainly much easier to use than the calipers and you can hook it up directly to the QEI module of a 18FXX31 PIC.
J-P
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