1. Three-level indoor environment comfort display 2. Indoor temperature display; test range: 0℃-70℃, 32°F-158°F, detection cycle: 10 seconds, when it is not within the temperature detection range, it display LL.L below the temperature range (and display at a flashing frequency of 0.5Hz), and display .H above the temperature range (and display at a flashing frequency of 0.5Hz) 4. Indoor temperature and humidity change trend indication 3. Indoor humidity, detection range: 20%-99%, detection cycle: 10 seconds, when it is not within the humidity detection range, it display LL below the humidity detection range (and display at a flashing frequency of 0.5Hz), and display above the humidity detection range (and display at a flashing frequency of 0.5Hz) 5. Indoor temperature and humidity maximum/minimum values are displayed on the same screen