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I could be wrong but I think most people are using their humidity calculation numbers incorrectly. Take Wolftracks' calibration yesterday that read 68 when it should have been 75. I think most everyone is subtracting the 68 from 75 to get the difference and then adding that number, 7 in this case, to whatever reading they see later... ie reading 23 plus 7 must be 30%
However, this is not the correct way to adjust your readings. What you need to do is divide 75 by your reading when calibrating... 75 divided by 68 equals 1.102941 (I would round to 1.10) then when you are looking at your reading later ie 23 you multiply by this number to get a true reading.. 23 times 1.10 equasl 25.4%.
The only time the actual difference is 7 is when the meter reads 68. When it reads lower than 68 the difference is much less than 7 and when it reads higher than 68, the difference would be more than 7. For example if it reads 10 it is actually 11, and if it reads 85 the actual would be 94.
Hope this helps!
No, this is confusing to me.