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Great.

New doesn't mean a thing. Sometimes brand new thermometers can be 10° off or more. Still, them agreeing is a good sign. I'll find a list tomorrow... oh, and if you're sure they're dead; eggtopsy and take pictures, please... sometimes they can be most helpful in diagnosing a failed hatch.

Are they calibrated? That's good, though. Where did you get the eggs? Were the parent birds being fed good quality food? I can't get a chart of causes of late term deaths right now, unfortunately, but I will tomorrow.

Good, sounds like humidity wasn't the issue then. Did you see my question about your thermometer?

Chicken-and-Duck by BantyChooks posted Dec 24, 2017 at 9:38 PM

Yep, it's supposed to be there. How big are they?

Your humidity looks way higher than 73%. I would be very skeptical of the control's accuracy. Please get another thermometer/hygrometer, calibrate them, and try setting incubator conditions by that. Also, you might well need lower humidity; they won't hatch well or at all if the air cell is too...

Did you click the link? It's showing you how to tell if an egg is dead.

Identifying Lockdown Deaths

What incubator did you use, still air or forced? Do you have a separate thermometer or were you trusting a digital thermometer/thermostat in the incubator?

Have you calibrated your thermometer? Also, that humidity sounds high. Were the air cells the right size?