0.0002" is fine to calibrate a pair of calipers but not really for a micrometer. I just bought a real gage block, which will be far more than sufficient for any

0.0002" is fine to calibrate a pair of calipers but not really for a micrometer. I just bought a real gage block, which will be far more than sufficient for anything I ever do: https://www.zoro.com/mitutoyo-gage-block-rectangular-100-in-asme-0-611201-531/i/G2547334/ https://www.zoro.com/mitutoyo-gage-block-rectangular-100-in-... Admittedly, this choice was a little more obvious before the recent inflation. Select your size and preferred units as required, of course. It was nice to see that even though mine is only Grade 0, it actually meets the Grade 00 standards. Not that that matters for me. Now all this is reminding me that I should actually go and check out that sketchy micrometer that was borrowed and abused....