I've been using Caliber meters for a bit and they seem to be some of the more reliable ones.. One of them is off by 2% for humidity, which is perfectly fine with me because hopefully my buds aren't that close to the edge where 2% RH would make a difference.. I've lately opted for mildly over-drying my buds and then introducing the Boveda packs to sort of "rehydrate" the buds.. I seemed to have achieved a better smell and taste during the cure, as well as I haven't had any hay-smelling bud in quite some time..