A mount for the basic, round, Amazon hygrometers. No desiccant area, as I run the Slice Engineering desiccant jars. Leave the base inside the AMS with the convenient locating pins.
There is a small hole in the back so you can poke the hygrometer out with a screwdriver or hex key. There are tabs on the top to make it easy to grab for removal when you need to replace the battery.
The author marked this model as their own original creation.