The SJ-201 is the most reliable and precise surface measuring instrument
available.
Brown & Sharpe Micro-Hite
24" Two Dimensional Measurement System. Measurements are made by an
opto-electric sensor moving over a high accuracy glass scale on precision
vertical guides. The Micro-Hite 1D/2D electronic height gage measures
external, internal, and distance dimensions as well as perpendicularity,
flatness, straightness, centers and diameters. In addition, the Micro-Hite
system calculates deviations and feature relationships, automatically.