Highly recommend www.sensorpush.com/ for a wireless humidity reader. The desiccant packs are great… as long as they aren’t completely saturated and useless. I have a pretty bad habit of buying a bunch of desiccant packs, throwing them in with the cards, but then forgetting about them for several months. The sensor is the bee’s knees and gives you a notification if the humidity or temperature is out of range (whatever you set).