Like anything else, I'm sure they can fail from time to time.
The older mechanical ones used a ribbon of a material sensitive to moisture that would change in length in response to changes in humidity, thereby operating a microswitch.
Newer, electronic units use a sensor made of a material who's resistance varies with changes in humidity, and an electronic circuit that produces an on or off signal in response to changes in humidity vs. controls setting.
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Today's Featured Article - Talk of the Town: The Pefect Collection - by Staff. Another neat discussion from the Tractor Talk Discussion Forum. The discussion started out with the following post: " I thought it would make for some interesting discussion for many of you to post what would be considered your dream or perfect antique tractor collection of five tractors, assuming room for storage and cost were not a factor. I have posted my "Perfect Collection" on the Farmall board. List any brand preference but keep
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