I think you were right when you mentioned that maybe you weren't making your point clear early on. I agree that some materials are not the diameter that is stated on the spool. Also, many materials test out at a higher breaking strength than what is listed on the spool (and a few test out with less strength.) This has bothered the Europeans enough that there is now a testing procedure available that puts the EFFTA approval on materials that past the test for correct diameter and strength. Perhaps that's what will happen eventually in this country. For someone who consistently gets high readings on most materials he/she tests I often think that they may have a defective micrometer, but if most of the materials you check are accurate or very close and others are off, I would say that either the manufacturer is careless about which label is put on with each spool or is deliberately mislabeling its product. Truthfully, I don't really know why a company would want to do this as there really doesn't seem to be any marketing advantage to it, other than perhaps coming off as having a stronger material to those fishers who don't check the diameter. Anyway, I'm rambling. I'm not sure what specifically can be done about it other than the rather costly prospect of having some independent testing concern test the product before it goes to market. Thank you, though, for clearing up the intent of your initial post.