This is a mounting module for the Xiaomi Mijia Bluetooth Temperature Humidity Sensor. I made it for my filament storage box to keep an eye on the humidity level inside - but you can use it with any transparent container.

It is made of two parts (top/bottom) and uses 4 M4 12mm bolts and 4 M4 nuts to connect to the lid.

To install it, place the nuts in the slots of the bottom piece and screw the bolts in from the top and through the lid of the box.

Here's a video about how I utilized this holder in my Filament Dry Box: https://www.youtube.com/watch?v=fUOdMoCvSVo