Ah, but is that caliper actually accurate?
Well I've got some gauge blocks, so I can check it.
14.01mm suggests the calipers are out by about 10 microns.
I did check the calibration docs for the gauge blocks. This block is 0.07 microns oversize. Or 14.00007mm.
Basically it's at the point where the difference in size is almost beyond accurate measure with the equipment I have available.
2/2
@SkipHuffman it's 23C currently in my flat. So I don't think it's that. The caliper was 5 euro over a decade ago. I'm amazed it's as accurate as it is.