I couldn't see the numbers on the hygrometer very well inside the enclosure so I made up a couple stands for them.
The models have a hole in the back for airflow to reach the sensors.
This is the link to buy the hygrometers -https://www.amazon.com/gp/product/B08P3QJJZL/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
The author hasn't provided the model origin yet.