While micrometers are pretty expensive devices, reflecting their high precision engineering and construction, this micrometer cost me only about £8, or just under $10, definitely in the spirit of ...

or other common measuring device. A simple, fairly accurate, and easily-made apparatus of the micrometer form may be constructed as follows: Get a common iron or brass bolt about y of an inch in ...

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 ...