The 1st thing that comes to my mind is that measuring the extreme end of any scale (in this case, the '100' mark of a hygro that goes to 100), would not allow for standard deviation(s) to develop; this would make results of a test or group of tests unreliable. Using virtually any other mark on the scale (except '0'), would be better - this way you can express accuracy as x +/- y degrees of rh. So, a valid test that produces any specific rh environment that falls somewhere between the extreme ends (in this case, 75) within which to check an instrument can have results that can be repeatedly duplicated, or, reliability. I think.
added - but, as someone pointed out earlier, experience maybe can minimize the need to even use hygrometers; just keep the box where you like it, rh-wise. I notice all cigars don't smoke the same out of the same environment - a Torano 59 torp smokes much wetter and is harder to draw than an Oliva rob. from the same box/rh (73).
Boils down to what works for you.
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