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 - Identifying Your Tractor - by Staff. Maybe you bought it from a friend who didn't know what kind of tractor it was, or perhaps (and this is every tractor fanatics dream) you stumbled across it in an abandoned field covered with weeds but intact. In any case, you have no idea what the make and/or model is. For awhile perhaps it doesn't really matter. Especially if it runs! But pretty soon you'll probably need to tinker with it a bit and maybe buy a part or too. Having a manual is nice. But how does one go about dete
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