The button type temp/hygrometer that you have is not at all consistently accurate especially in high humidity applications. A bunch of us here use these pictured below. They are very inexpensive you can find them at Amazon and Home Depot or Lowe's. Make sure you get the ones that check humidity and temp at probe. some of them only check temperature at probe but the mechanism will check heat and humidity(not accurately in high humidity apps). The idea is to keep the mechanism outside of the humid area.