I think the perfect way to test the moisture level is with a grinder. When weed is a tad bit on the wet side, nugs tend to have trouble grinding. They get stuck in the top part and won't fall through. When weed is perfect, it grinds up very fluffy, and grabbing it out of the compartment reminds me of grabbing a pinch out of a skoal can. When it's too dry, it powders up when you grind it. That's just my personal method.