What’s the difference between the Brinsea Mini II Eco, Advance and EX incubators?

The Mini II Eco is the most basic machine, it uses a liquid in glass thermometer for the temperature reading (there is no humidity display) and egg-turning needs to be performed by hand. You need to turn the eggs 3-4 times a day. Whereas the Mini II Advance and EX versions have a digital display for the temperature and humidity, as well as automatic egg turning.

In addition to the Mini II Advance features, the Mini II EX has automatic humidity control which draws water into the incubator automatically as its needed, accurately maintaining the humidity at the desired level.