[T.G]

Credos have no visual indicator Mike. You have to wait for the humidity to drop in your humidor to know that they need watering. Furthermore, they are just plain horrible humidifiers. One way only, no capability for absorbing excess moisture, no indicator of when they need watering, great potential for mold. They were great at one time, but mind you, so was a clay brick soaked in water, in fact, there really isn't much difference other than the brick being around for a century or two. We have the technology for better, so why not use it? Ditch the Credos and get beads (or gel, although gel doesn't absorb excess moisture/humidity very quickly).