We set the unit in AutoCAD - Command Units
Units in AutoCAD can be set manually with the command Units, or from a string Format string Units menu.
The result appears Drawing Units dialog box, where you can configure the units. In this window, we can set up both linear and angular units and establish their accuracy.
In the video tutorial AutoCAD, we analyze in detail all the settings dialog box Drawing Units, as well as the display of the accuracy of measurement units.
Video "in the AutoCAD Units" (Russian)