Hygrometer Clip onto the top of the AMS Lite for A1 Mini system. This version has room for both a dumb and smart Hygrometer. I've put links to both below. The SwitchBot Hygrometers provide quite a bit of information.
Dumb Hygrometer:
https://www.amazon.com/dp/B08P3QJJZL
Smart Hygrometer:
https://www.amazon.com/dp/B0BVZC9Q31
SwitchBot Hygrometer Dashboard: