I know I should not include this topic because I can imagine that this will not be very useful to other discipline of AutoCAD users because mostly, Architectural and Civil engineering have the most user of AutoCAD. Just to share my little knowledge to the world wide web that such profession does exist. Many of my drawing are measured in microns ( metric unit of measurement) and mil (english unit of measurement: thousand of an inch) and the tolerances are so small, the smallest is 1 micron. Can you imagine that, you need a micro scope to see the tolerances.

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