I have been dry incubating in it so far, (this is my first incubation with this incubator) I just added water to it, and am waiting for it to bring up the humidity where I want it.
If it doesn't get where I want it, I will just add sponges in the bottom.
If it doesn't get where I want it then, I will just put the eggs in my cooler incubator/hatcher, it holds humidity REALLY well.