A minimalistic enclosure for a common low-cost hygrometer–thermometer, widely available online (i.e.  [https://www.amazon.de/dp/B0F2HZJRC9](https://www.amazon.de/dp/B0F2HZJRC9).) There are many similar models with identical dimensions that also fit this enclosure.

The design is clean and unobtrusive. The hygrometer snaps in without tools. The tolerances hold it securely in place, while still allowing easy removal for battery replacement. The model is designed for quick printing and low material usage.

I use it in my filament storage boxes to monitor humidity, but it can be used in any enclosed space.

Supports are not required, depending on print orientation.