For 44mm dia. Hygrometer.
Mounts through factory hole in X1C chassis.
Hygrometer:
https://www.amazon.com/gp/product/B07WJJ9265/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1
suggested screws:
https://www.amazon.com/gp/product/B00GDXURBA/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1