Proper humidity levels in your home prevent mold, bacteria, viruses, fungi and mites. This thermometer/hygrometer monitors conditions so you can check them at a glance. The humidity level indicator shows LOW (too dry), HIGH (too humid) and OK (ideal humidity) readings. You can adjust these as needed. The temperature sensor shows degrees in either Fahrenheit or Celsius. Daily high and low temperature and humidity records are also available. For convenience, place the unit on a tabletop or magnet-mount to a fridge or other metal surface.