When choosing which calipers are best for a job, he points out two critical features to measure them up against ... black lines on both images, and the thickness of black and white lines. [ ...

A caliper — a ruler with sliding jaws ... the spindle so it can fit inside a pipe or tube casing when measuring the wall ...

But perhaps more importantly, this is also the cue for an examination of high precision dimensional measurement. So I’ve assembled a collection of micrometers and vernier calipers of varying ...