About year ago, I ordered the Blue Devil CYA test. I'd read it was much easier, and to me, it is. I don't remember comparing the two, I just switched over to the blue devil. This year, I compared the two. Taylor says 60 and Blue Devil says 100. I figured testing error even though both are repeatable until you're consistently comfortable. Ran the tests again last night and got the same results from both - taylor 60 / blue devil 100. I know the BD loses accuracy over 60, but any ideas as to why the wide difference?