Have no idea on the moss
I purchased my gram scale from pangea. But it was several years ago so I am not sure if they have the same model. You basically want something that will measure in 10ths of a gram if possible and has a tare (not sure on the spelling) function so that you can put the holding container on it, "tare" it to zero, then weigh your gecko inside the container. here's a link to pangea's scale page. I think the original one I got from them was the first one listed.
For your humidity issues, you could try covering about half of the screen top with either a piece of plexi or try the screen top foil treatment.
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