Buy a couple small humidity meters.
($8 - 25ea.)

Put one in the jar and one right next to the jar.

I used to think I could sense the humidity by the way I felt.
Boy, was I wrong!
Worse than random.
A meter is a must.

I use Caliber IIIs
Bought 6 of them.
Attachment 298243
Way cheaper than even one jar of ruined meds.

Never let them get below ~ 55% or they will stop curing!
And it can not be restarted by moistening.

Or over ~ 70%.
That will ruin it in a matter of days.

I like 62% for several months.
Attachment 298244
It just keeps getting better.

Aloha, Yall
Happy curing.
Weeze