Are you supose to take that rubber ring off your hygrometer when using in your humidors or does it still reads the humidity with it on.

never used one.

get some 65% Rh Beads and "set it and forget it"

I haven't used a rubber since college...

I took mine off. Not sure if I was supposed to or not, but it works fine.

Rubber ring?

I think those are on there to keep the hygrometer from falling out of the hole that most humidors have for the hygrometer placement. If you're just setting it inside of a cooler or desktop without that hole, you don't need it.

Pro