I bought the cheapest 1um resolution DRO I could find on Aliexpress for my mill.
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I paid approx £176 (US$243, EUR204 - at time of checking).
These appear to have a 1um resolution, but once i have fitted these to my mill, I will make some more accurate measurements. I would imagine the accuracy is more like 5um - stay tuned to find out!

Edited (badly) with a combination of openshot and DaVinci resolve.

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