gmjarvi
Songster
@Kizmet you can also weigh them if you have a kitchen scale. A chicken egg should lose about 13% of its weight in the first 18 days of incubation. Of course, this only works if you weighed the eggs before you started incubation.Use a candling guide to mark your air cells. If they look too small then lower humidity and too big you increase it.
If an egg has lost too much weight too quickly then humidity should be increased so the egg doesn't evaporate as much moisture from within. If an egg is not losing enough, then humidity should be decreased so that the egg can lose more moisture.