Three types of humidifiers are used for humidors.
Most lower priced humidors are equipped with a humidifier with a simple sponge inside.
In the next category humidifiers contain superabsorbent crystals which can hold the humidity for a longer time without recharging and which possess superior characteristics in terms of the amount of humidity that can be emitted and also to the humidity level at which they stabilize.
The top choices are active electronic humidifiers such as the cigar heaven and the cigar spa which keep cigars at the desired humidity level and have become quite affordable. They not only add convenience but also save time.