Further info, I have three fans running for circulation. I use a Hydra LG electronic humidification device. Always distilled water. I have a tall cabinet similar to this one
http://www.cigarsinternational.com/h...power-humidor/ only with more shelves and less drawers. Cigars are on cedar trays for the most part, singled stacked. I have roughly 600 in there. I use three different hygrometers, top, middle, and bottom all of them electronic. I haven't changed the batteries or calibrated them recently, but they all measure within 3% of each other regularly. The top ( furthest from the Hydro system) measures a bit lower but only by a percent or two.