I redesigned them mostly from scratch to make them slimmer and fit in th AMS with the new Hydra Pro mod.
They're about half the size and fit in the Hydra Pro AMS like a glove. The convenient knurled tab on the back make it a breeze to pull the container out to swap out the silica.
The hygrometer model will fit both versions of the circular hygrometers (straight or slanted).
I purchased this one found here: https://www.amazon.com/gp/product/B07GR65CNT
The author remixed this model.
I re-designed them mostly from scratch to make them slimmer and fit in th AMS with the new Hydra Pro mod.