Speaking of RH and AMS units—I recently replaced the desiccants in my (old) AMS units because they were reporting close to 20% RH. A few hours after the swap, they proudly displayed 0% RH… which, let’s be honest, isn’t exactly realistic unless I accidentally created a vacuum chamber. 
Once again, this just proves how useful it would be to display AH instead of RH. At least then the numbers would make a bit more sense—and maybe stop making me feel like I’ve broken the laws of physics with a bag of silica gel.