ALL of the calipers I have seen in the last 12 months have data output- even if they say they don't. There are three types of output, Mitutoyo format, Starrett format and "Chinese" format. The Starret and Mitutoyo are fairly slow and straightforward. The "Chinese" interface screams out at 90Khz three times per second in two 24 bit words. It is just catchable on an X2 8052 clocked at 20 Mhz.

The manufacturers also supply machine head DROs for machine tools and arbitrary measurement tasks - they are available in upo to 2 metre lengths.

Try
http://www.littlemachineshop.com/products/...-561213210

Steve