For years I've messed around with those expensive cigar humidifiers that attempt to reach the proper 68-74% humidity range, and the picture at the bottom right shows the I didn't achieve. Those I threw that out and bought a couple of plain kitchen sponges, put a dry one on bottom and placed a wet one on top. The picture at the bottom left notes my success, now in clearly the good range. On top of that, it's now so much easier to maintain than before. Double score!