Measuring humidity?

Benjamin J Walter bwalter at
Tue Oct 29 17:46:38 EST 1996

Does anyone know where I can find information on building some kind of
humidity sensor?  I want to record environmental data (eg humidity
and temperature) electronically to compare growth rates, but so far
I've only cme across very high priced commerical sensors (e.g.

Any help would be greatly appreciated!



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