This one's dedicated to you, John …
A celebration of the ten-thousandth
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On the occasion of my ten-thousandth posting, I would like to share this:

It's a simple photograph of one ten-thousandth of a metre [*]
This cropped, but unmodified, image is 1000 pixels wide, which splits the outer graduation lines.
To a good approximation therefore; each pixel represents one ten-thousandth of a millimetre
[i.e. one tenth of a micrometre] [a.k.a. 'a tenth of a micron']
It pleases me that, using readily available & reasonably priced equipment, it is quite practical to measure to this resolution. … Obviously, I cannot certify the accuracy or temperature-stability, but; for Bodgers, near enough is good enough.
Please get well enough to argue the toss … it's more fun than rivet-counting.
MichaelG.
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[*] part of a Carl Zeiss 'stage micrometer' photographed using a 10x objective and 3.4x photo-eyepiece
… full frame is 4000×3000 pixels, representing 0.4mm of the scale.