Email email@example.com for your file Ref 6Q9
Open the file ACA50-01.dwg
What is the decimal scale of the viewport set to in layout tab A1?
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You may be used to double clicking inside a viewport to set it's scale. You can do this and read off the scale from the bar at the bottom of your screen. However what if you have accidentally rolled the mouse a little?
A more accurate way is to go into paper space because a viewport sits on Paper space. That's double click on the grey or white area, to see the triangle shaped UCS Icon. Or type PS, the short cut for paper space. Then click and grip the viewport outline and right mouse to read it's scale off the properties pop up menu.