Measure distances in mm

CrossRoads:
No, I mean something digital like one might find on an incoming-inspection table, or perhaps a calibraton table, for automatic recording of results.

This sort of thing?
http://www.tormach.com/store/index.php?app=ecom&ns=prodshow&ref=31761
plus USB interface
http://www.tormach.com/store/index.php?app=ecom&ns=prodshow&ref=31865