The three Ovation 56 machines have different features. The Ovation 56 Eco has a digital temperature display and automatic egg turning. It’s the most basic version of the three.
The Ovation 56 Advance is the mid-spec machine. It has all the same features as the Eco, except the Advance has a digital humidity readout too.
The top of the range machine is the Ovation 56 EX which has every feature from the Eco and Advance models; digital temperature display, digital humidity display and automatic egg turning. But the EX version also has automatic humidity control with a built-in pumping system. Whereas, on the Eco and Advance models, humidity must be controlled manually by filling water troughs inside the machine.