I have done lots of searches and I think they are called - hygrometers?? Is there any local stores I can purchase these at or do I HAVE to buy them online? I read that some people have gotten them at Wally World, Radioshack, Petco, etc. but I have to drag 2 toddlers around with me so running from store to store for a quick 5 minute errand is going to take 30 minutes or more at each store! When I looked at Wally World in the light bulb section all I found were thermostats and a couple of thermometers but they were EXPENSIVE....$40 and up!! This whole incubator and hatching thing is a test to see if I can do it before I go spending money on the eggs I really want so I'm trying to be as cost effective as I can. I'm not saying I won't spend the money I need to but I don't want to end up spending more on a hand-crafted incubator as I would have one of the high end jobbies. So any how, where do I buy the humidity reader doo haw?