The beurer HM55 thermometer and hygrometer display the time, temperature and air humidity of the room via a display. In addition, you can see at a glance whether the climate in the room is good. When the climate is good, the display will turn green and when the climate is bad, the display will turn red. Download the free app and you have an overview of all measurements from the past period. When you have more Beurer HM55 thermo- and hygrometers, all measurements are displayed on the app. This way you immediately have a clear overview. The thermo- and hygrometer works on 2 AAA batteries so you can place the meter at any desired location.