The perfect temp is floor contact in a northern room on the first floor of any building. The perfect humidity is chosen by you and maintained by something as cheap as a mason jar.
What else does this thing do? You can keep a qp of perfect smoking bud in a perpetual smoking vessel, opened regularly, to no negatives. I think instead of buying a stupid curing tek, I'd seriously think about the herb I'm smoking if it needs special care for any reason (9/10 it's chemical dust needing moisture to pretend it has healthy cells, thick resin, secondary metabolites and solididity). I mean if the candles, motor oil or pine incense i buy needed brovida packs.... They're fucked up products.