The humidity levels of healthy indoor air should be 30–35 %, but in most modern homes the indor air is much drier. There are many factors that affect the humidity in a modern home. Especially effective ventilation lowers the humidity. Mechanized drying of laundry and diminished cooking in the apartments also reduces the humidity. During the heating season, the the relative humidity in apartments in buildings with central heating can be very low, even below 10 %. Dry indoor air feels unpleasant, it irritates the airways and causes fatigue. Additionally, allergy symptoms might be emphasized, since dry indoor air contains more dust than humid indoor air. It is easy to check the humidity of your home's indoor air with inexpensive and efficient humidity meters. Ufox effortlessly ensures healthy humidity levels in your home.