I've been introdiced to hearfelt beads from some of the posts and ordered a 65% 2 oz tube. It is managing my rh very well, but I guessed at the amt. of water to add.  I can't see into this thing well enough to know what % of the beads are clear. Musta guessed right . . . seems to be working fine -- but is there a trick to seeing the beads inside the tube? 

Roger, I have the same tubes in my humis. If you look at them with good light you can see the beads through the mesh.

You should be able to open both ends up.

Thanks. I tried that, but they seemed stuck on pretty good & I was afraid to force it. I'll take another look. Thye're working just fine by the way -- holding 65% nice & steady.