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go to a pet store (petco, etc) and get a thermometer that measures humidity. I think it's called a hydrometer. People use them for their reptiles to monitor humidity. That's why pet stores sell them.
BTW: I went to Walmart for a thermometer and they do have one that shows humidity, but I opted for a little better quality. It was 3 dollars and just looked really cheap. They had like 5 left and they all said different temperatures and different humidities. I was like... Ok, so which one is right? Forget it! So I went to a pet store here and got one for 13.99.