To make effective use of a high precision metrology system, one needs to understand how it works, how to squeeze the best performance out of it, how to choose the optimal one for the application and what to do if something goes wrong.
Regardless of the technology employed, the desired result of force measurement is the same-measure the force applied to capture a reading for validation or further analysis.
Introduced in the 1940s, optical comparators are still being actively used to verify that manufactured parts are within tolerance, including those with complex geometries.