Edit > Units converts the unit of measurement from one system to another on all objects in the Model Manager, or scales the objects by changing the unit name without re-conversion.
The parameters are:
Scale Model radio button - specifies, for example, that “inches” be changed to “feet” without dividing by 12.
Change Display radio button - specifies that the units be converted with appropriate mathematical conversion.
Units dropdown (inches, millimeters, feet, centimeters, meters, kilometers, microns) - specifies the unit of measure.
Press OK to accept the operation, or Cancel to terminate the dialog.