Thank you for all the valuable information on hygrothermographs.  Now
that I have digested it all, I have a new dilema.  If I were to look
into purchasing a datalogger, where would I begin?  Who makes them?  Does anyone
 have the
name of a supplier or two?  Who do you recommend?  How much are they?
 How many would I need for a 2 floor  6,000 square foot exhibition
space?  How many hygrothermographs would I need for that same space?
Is there any literature on the subject of either hygrothermographs or
dataloggers which I should read?