Astrida,
First, you should figure out how precise/detailed you want your
readings.  If you are looking for a 'thumbnail sketch' of the
environment, I would suggest either basic digital hygrotherms or the
Boxcar and HOBO system.

At our historic house museum (about 10,000 square feet) we have switched
from taking daily temperature and RH highs/lows from basic digital
hygrotherms to the 'automatic' HOBO and Boxcar system.  For the money
and for our needs, the HOBOs work great.  We now can take readings from
the sensors via a portable 'shuttle' and download them into the computer
weekly.  The data are graphed automatically, depending on what sort of
information you want. You can get more info at their website
www.onsetcomp.com  .

However, if it is just the roughest of info you need, digital
hygrotherms are readily available and cheap.  We made up an Excel
spreadsheet to chart the data ourselves.

Let me know if you need more info,
Fielding
Redcliffe Plantation State Historic Site


 

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