If you were thinking of switching from a fogger to an ultrasonic humidifier, I can save you the trouble. They're the exact same thing.
Almost all humidifiers will produce fog to some degree. The only exceptions I know of are evaporative (wick) and pass-thru (bubble) humidifiers. Wick humidifiers basically use a wick to draw water from a reservoir, then a fan blows air across the wick, picking up moisture as it goes. Heated wicks are better than non heated, but they're not exactly falling off of the trees. Bubble humidifiers pass water through a column of water, and the air picks up moisture as it goes.
Neither of those is going to generate the kind of humidity you can get with a fogger. That's why I use one. Mine is controlled by a hygrostat, but if you're saturating your substrate, turn the fogger all the way down and aim the outlet at a hide or something. That should diffuse the fog enough to stop soaking things.
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