I have the 20 Eco without turner and humidity pump - I don't use a hygrometer, I add water to one of the troughs every three days. I turn the eggs by tilting to one side twice a day - I have noticed I have much better hatches than with a hygrometer, no matter which one I used,they were always off even after calibrating. This is stupid proof to me. I guess it's the are I live in. I also have the mini eco, and do the same, add water to one side every time it looks a little less than full.
