I am using Inkscape 0.92 and I am trying to make a 1:1 size image of a physical part. The measurements of the part are 9.875 inches wide, by 6.875 inches high. However, when I zoom to a 1:1 and hole the part up to it, the rectangle on screen is much bigger. So I did some googling and found edit/preferences/interface zoom correction factor. I thought, this would fix the problem. I whipped out some callipers, set it to exactly one inch, and then scaled the on-screen ruler's inch to match my calliper's inch. I then created a 1 inch rectangle and measured it with my callipers and it was a perfect 1 inch square. Then I created the full size rectangle and it is not the right size. It is longer and wider than it should be.
Anyone know whats going on here?
Below are screenshots of the issue. The blue square is set to 1 inch square. Holding a ruler up to it shows it to be exactly 1 inch square. However, putting the ruler to the red square, which is manually set to 9.875x6.875 inches, you can see its 10.5 inches on the ruler. If the one inch square is 1:1, why isnt the bigger rectangle?