Product review (5 stars): This thing is handy!!
This thing is handy!!  Used for monitoring my grow tent, its nice to be able to watch temp and humidity with out continually running to the tent.
As the tent is small the humidity can fluxuate quickly, by remotely monitoring I'm able to stay on top of things where ever I am and determine if there is a need to intercede. At $20 it's hard to go wrong.