Why are the values different on several Xiaomi Smart Temperature and Humidity Monitor 3?

Temperature and humidity are easily influenced by the external environment. People approaching, moving, or breathing can cause changes in temperature and humidity. Even in the same room, there will be differences in temperature and humidity between the two points. The scientific testing method is to use a dedicated constant temperature and humidity chamber to measure the accuracy of temperature and humidity.
It is recommended that you place several monitors in a relatively enclosed environment for about half an hour before making a comparison for reference.
The Xiaomi Smart Temperature and Humidity Monitor 3 refreshes the temperature and humidity value every 6 seconds.