Yes exactly. I was blown away (ahem) and instantly regretted my life choices, which until that point had not involved microns in any way shape or form. The ins

Yes exactly. I was blown away (ahem) and instantly regretted my life choices, which until that point had not involved microns in any way shape or form. The instrument readout looks like this: https://www.perfectionmachinery.com/assets/item/hires/40961_7.jpg https://www.perfectionmachinery.com/assets/item/hires/40961_... except his had adjustable ranges. Every tick on that needle is one millionth of an inch - by comparison a red blood cell is about 40 millionths and the smallest bacteria is about 5 millionths long. This instrument has a read head connected with a cable, that has a finger on it that rests on the part under test. Under normal use you'd slide the part around under the finger to look for variations in thickness - obviously that requires and extremely flat surface to slide around on.