[CAUT] A record low humidity reading, for me

[Ron Nossaman]

> 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