I've liked the DHT11 (aka RHT03) for household humidity measurements. But the spec sheet I have has shows that they 'want' a RH of 20%-90%. I'm not sure how they'd do in a condensing environment longterm, although it does say "* Avoid using the sensor under dew condition."
The spec sheet says its a resistive-type humidity measurement sensor. I'm guessing its not the salt kind, so conductive polymers most likely. Not sure what codensation would do to the sensor over time.
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