As one does I found myself browsing, one thing led to another, and I bought a micrometer screw gauge. While micrometers are pretty expensive devices, reflecting their high precision engineering ...

Spherometers consist of a micrometer screw, a vertical scale or graduated post ... Spherometers use special rings and precision flats to provide a platform for optical testing. Spherometer rings are ...

A couple of years ago we published a look at precision measurement tools, in particular vernier calipers and micrometer screw gauges. It featured a look at how they work and how they’re used ...