> Thanks Ron, I think. It would seem as though you feel that the > calibrating media are a bit overpriced. Upon reflection, Yikes! I wouldn't call it a feeling. Perhaps a fact. >Are you > also suggesting that the tool itself is of questionable value? I didn't say anything to even remotely suggest that. >Any > idea as to where I would find the explanation for the characteristics > (75% & 33%) you describe, or how precise the solutions would need to be > (in case we have a bad winter)? Google calibrating a hygrometer with salts. There are plenty of them listed. Ron N
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