I am just getting back into chickens. This is my second try. Last incubator full I had a low hatch rate. Many of the chicks were partially or fully developed with no pipping. So I added ventilation. I purchased a digital thermometer I found the mercury thermometers were reading a bit cool. Now I had 5 out of 7 hatch from one breeders eggs and 0 out of 10 hatch from another. The only thing I can see that might be a problem is I moved eggs to a still air from a forced air to hatch. One time I caught the still air at 102.2 but other than that I am baffled and very frustrated. I have 2 more sets due to hatch today and Fri. Any helpful hints???? All the eggs were mail ordered from ebay. I did not let the eggs set for 24 hours prior to putting them in the incubator could this be the problem?