The eggs on the very bottom of the incubator are the current hatch. The eggs on the upper shelves are the next hatch, staggered for two weeks after this one.
The concentric rings are where I marked the progress of the air cells during incubation to make sure the eggs were on track. Usually I'd only do it 3-4 times, but with the new incubator I wanted to be extra cautious. The shot glass holds water to keep the humidity correct, and the little thing on the right is a hygrometer. The upper shelves have their own thermometer/hygrometer setup.
We've tested the cam and everything is as ready as it's going to get! When I did the final candling yesterday, I saw lively, squirmy chicks in all 15 of the eggs except two--these two may be late quitters, or merely fashionably late--I'm leaving them in the incubator to give them every chance. This morning one of the eggs peeped at my husband when he spoke to them, and wiggled energetically for me when I talked to them.