The Diamond Crown humidifier has as special wick-type material and a large water reservoir which helps maintain a 70% relative humidity for a very long period of time. The humidifier also features adjustable vents allowing you to open and close them for more precise humidity control.
On second item in 12 months. Keeps low humidity levels. I had my old diamond brown for twenty years never had problem. Help
This humidifier came with my humidor,it has to be one of the easiest systems on the market. All you need is distilled water for under two bucks a gallon, no polypropylene glycol! You can see through it to the water level, no guessing when to refill. And it has a slider to adjust the level of humidification. The Diamond Crown is not inexpensive but IMO, one of the best,simplest devices you will find and worth the investment.