A bracket for mounting the below linked humidity/temp sensor. Also included is the Fusion 360 file so you can add your serial number, as in the picture (The included STL has no serial number). The one pictured was printed with two colors using a 2to1 adapter, but if you export only the "Main Body" from Fusion, it will leave a void where the second color is.
Amazon link: https://www.amazon.com/gp/product/B07GNMKYCZ/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1