Getting DXF/DWG Imports to the correct Scale

Firstly, never import a dxf file into an existing drawing…
Then, when you import a dxf file and you can’t get the scale right, find an object that you know the size of, something with a dimension on it.
Measure that object after importing.
Select All
From the Menu Bar choose Modify > Scale Objects…
Rescale the drawing to suit using the Scale Objects command.
Select the options:
Scale Text
Entire Drawing
Enter the scale ratio as A/B where:
A= the original size of the object 
B= the size of the object in the imported file
Click on the OK button and the draw will rescale everything.

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