> The one I mentioned is: > http://www.generaltools.com/Products/Calibratable-Digital-Psychrometer__EP8706.aspx And down below are the salts for calibrating it. A saturated dish of good old table salt stabilizes the RH% in a sealed container at very close to 75%. The other is magnesium chloride, used by the ton as a road deicer, as is salt, and for making tofu (figures), which will produce very close to 33% RH under similar conditions. Both at a bargain price of only $33. Ron N
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