Hey Phx
I got mind at Plant ligthing hydroponics,an oregon scientific temp&humidity sensor.It works great and you can get the deck top montor so you dont have too look in where the plants are.Or you can just put it next too the plants and look in to see the temp and humidity.Nice lillte sensor and the prices are good too. Plantlightinghydroponics.com
Good luck and keep us posted on the grow.