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  53.3%
Rain
a2012

This moisture detector is constructed from fabric stretched between brass support which also serve as contacts. The conductance of the wet fabric pulls against a 100k resistor to ground.

  55.8°
Crawlspace
c21530

This sensor is in the crawl space underneath my daylight basement. It is exposed to the outside through a half dozen ground level vents.

  57.1°
Backyard
c63411

This unit is placed outside the basement window at the end of a steel tube that holds the sensor several feet away from the house.