Markups created before calibration retain their original (uncalibrated) scale. Markups created after calibration will follow the new scale. This results in inconsistent sizing between old and new markups. It would be nice to be able to calibrate the existing markups that were uncalibrated without having to delete the original markup and create a new markup. Uniformity across multiple sheets is important. It would also be nice to be able to setup calibration for multiple sheets at one time.