The most widely reprinted article I’ve ever written was my 1988 "Wound Roll Quality Measurement." It has been reprinted in both of my winding books, my Web101 class notes and many other venues.
First, the article provides a detailed discussion of the dozen or so roll tightness measurement systems. Second, it shows you how to simply determine how good those measurements are for any particular application. For example, the best roll hardness measurements can easily see changes in the winding or web thickness profile variations on almost all paper grades as well as on many film grades.
However, the worst methods or applications are no better than random number generators. In other words, test the tester before you put any faith in the readings. I have found this to be a good mantra for all measurement systems, not just those for wound rolls. This is the computer animation and narration that I used as "slides" for this presentation.
Web201.55c YouTube clip link: