Low hatching temp for large eggs?

[ABQ chicken keeper]

I have the same incubator and I've had good success with it. I have a second thermometer inside that says the temp is (now) 99.5. Or rather, the red line hovers just a hair below 100.

Other than unfertilized eggs, my hatch rate is very high with just set and forget. This time I moved it because the afternoon sun was driving the temperature up, and I wanted the space in the sun for plants.

I just chose the wrong spot. It's now in another area of the house, with no sun, no drafts, and a blanket around it. Egg temperatures have risen to more reasonable levels since I measured this morning.

How are measuring the temperature of each egg? Did I understand that correctly?

 

[LaurenRitz]

How are measuring the temperature of each egg? Did I understand that correctly?

I have one of those handheld gunish things. Not sure if it's accurate, although the things that I've measured outside of this project it has been within the expected range. I'm sure the temperature inside the incubator is correct.

I hold the thermometer about 3-4 inches from the round end of the egg. I have to measure one at a time, because the temperature of the eggs goes down very fast.