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About $60 on Amazon (if available in your area) there is a Tao Tronics Humidifier that you can set the RH digitally and it self monitors. If I want it 55% RH I set mine at 60% and end up close to 55% at plant canopy, even though it is 60% down low where the humidifier is. Works nicely, only holds a gallon though, but it will make it rain in there if you want. I have been eagle eye studying the VPD chart linked on Royal Queen Seeds site, and my latest plants are much more happy in that sweet zone.