I was hoping that given the size according to its own scale it would be more accurate if you used the same surface and rotated the plane 1/2 degree from side to side, even on one On a nearly perfectly level surface, it shows a 1/4 degree deviation, so use it as a reference, but don't expect to align your CNC or gravity 3D printer to it. I took two pictures in this environment with different spirit levels, one picture is just rotated 180 degrees on the same surface and in the same place and shows a big difference.
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