Thermostats are for temperature control, not humidity. I use a DIY rack, and RBI rack, and a tank and I don't need anything other than a water dish for humidity in any of them. You tape the probe on the heat tape because you are controlling the heat tape. You control the maximum temp it gets to, if it's not in direct contact with the heat source then you aren't controlling the heat source....
Thermometers go inside to read temps, thermostats go outside to control temps...
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