#Outdoor proof Soil moisture sensor + switch
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The cheaper they are, the less likely they will be sealed.
The Apollo ones are not sealed. Ecowitt ones look sealed but are not.
-# Ask me how I know...
Did you find any that are sealed and pretty accurate?
And why do they make moisture sensors if they are not waterproof?
Houseplants.
But if you water them, there's also a chance water goes onto the device
A sprinkling can is easier to control than the rain, though. I mean they have some waterproofing, but I have lost sensors trying it last summer.