I’ve been trying to keep my VPD low for the itty bitty plants, but because the cooling I have available is piping in outside air (recall, even though it’s 77F here today, it’s still wintertime) which comes in dry. As a result, I had a choice between ~80F & 40% and like 70F & 35%.
I have a single disc ultrasonic fogger with a small fan pointed at it for humidification. It works, but it doesn’t have the capacity to significantly change the humidity in my 400 ft^3 tent.
So, to increase my humidification capacity, I bought a 12-disc version: https://www.amazon.com/gp/product/B0BGZ18FNC, put it in a large bin of water and pointed a small fan at it…
And it is capable of turning the whole 5’x10’ tent into a cloud! My poor plants must think they’ve moved to the coastal redwoods or something.
I use their 2gal quick fills just for fun. Got them on sale - don’t have an automated top watering system but they fit perfectly in a round autopot, and they bottom feed just fine. It’s great.