Again,
most humidifiers don't have a
sensor or a LED screen to provides you
most accurate measurements indoor, that's why I recommend you to use this hygrometer to monitor
humidity levels in your baby's room.
However, early radiosonde
sensors suffered from significant measurement biases, particularly for the upper troposphere, and changes in instrumentation with time often lead to artificial discontinuities in the data record... Consequently,
most of the analysis of radiosonde
humidity has focused on trends for altitudes below 500 hPa and is restricted to those stations and periods for which stable instrumentation and reliable moisture soundings are available.