I work with many scanned construction drawings in PDF format, but when I try to do takeoff or measurement, the scale is not correct and lines are not clear. It makes my work harder to get accurate quantities.

I was learning about some professional services like https://tylerestimating.com that handle this kind of work very well, but I still want to improve my own PDF measuring process. Can anyone tell me what’s the best way or Acrobat feature to make scaled measurements on scanned drawings?