Micrometer resolution

[mjr350]

Cheers everyone. I understand the idea of splitting the graduation into 3 and it makes sense. I'm thinking I'll spend the extra on a quality .001 set rather than go for a cheaper .0001 set.
There are quite a few used quality brand names on my local Facebook market place so I'll start there.

 

[RJSakowski]

As a former employer, we used to cover the fourth decimal on our DROs to prevent the machinists from spending time chasing that last zero. It's the nature of a machinist to seek perfection, regardless of the requirement. How many of us have taken "just one more pass" even though the part is in tolerance? It can also cause errors when mis-read. Shooting for 1.125 but getting 1.1125. DAMHIKT.

It's a matter of training. I have been reading displays with extra digits for fifty years and extracting the information needed for the task at hand is second nature. My calculator displays ten digits but if I need only four, I look at the fifth and round up or down for the fourth digit. This is so ingrained that I don't even think about it.

My phone camera has 22 megapixels for tremendous resolution even on blowups. When I post photos to HM, I lower the resolution to about 500k pixels to reduce file size. When I do so, I lose information that can't be recovered and blowups are pixelated. Lower resolution is lost information.