"I have just done an interface to a caliper too."

Guys can you hear the tom-tom...?

OK Babar coming back to your question :

What resolution and range are you looking for ?

Look for LVDT probes - like the ones offered by Baker. You get a analog out and then you can digitize it for transmission. The only problem here is that the span keeps reducing as you increase your resolution specs. I just used a probe with 3mm span but with 0.1 micron resolution.

I generally had a feeling that the linear encoders used in caliphers are of the optical type and are difficult to source and use. Unless Steve can add more on his interface...

Raghu