This is a hygrometer wallholder. It fits for this hygrometer:

https://www.amazon.de/gp/product/B07JDSHD4Z/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1

You can glue it at a Wall of your transperant dry box and slide the hygromter in it.

I used this glue tape:

https://www.amazon.de/gp/product/B098XGZ1H4/ref=ppx_yo_dt_b_search_asin_image?ie=UTF8&psc=1

Now you can watch the humidity from outside without opening your drybox.

Print Option:

Bambu Lab PLA

15% Infill

Print it with the “tape side” up.

If you have any questions, feel free to ask.