I figured that a Hydrometer would be useful for the ACE pro. Since I'm in a very humid area, I created this to keep an eye on the humidity within my Anycubic Ace Pro. It's saved me a lot of problems relating to Humidity.

I place the URL from Temu for the hydrometer that I used in the picture. The Hydrometer doesn't come with this stand.

Round Electronic Temperature Humidity Meter Reptile - Temu

I modified the desk hydrometer from Department Nine on Thingiverse, so that it can sit on front lip of the ACE Pro as seen in the pictures. 

I used PETG for the stand and haven't had an issue yet.

Enjoy