Noobie.. How can I tell if my humidifer works?

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You can pick up a hygrometer pretty cheaply. You can take out the cigars and throw in the hygrometer if its too small to just leave one in there. Check the humidity that way. Other than that you'd have to leave some cigars in there for a while and see if they get too dry or too wet or if mold starts to grow. I wouldn't recommend that way though.