I put my 5th batch of eggs from my chickens in my incubator over the weekend. It has an automatic turner and the humidity is between 55 and 60%. I have never gotten a live chick from my incubator. I had a little cheapy one that I couldn't keep the humidity correct and then bought a nice big one with the turner installed. Last batch I put 8 eggs in but only 5 had a dot in them on day 4. I kept them in there until they were 3 days overdue. Then I cracked them all open and 3 were nothing, 1 was a teeny little chick that had started and failed to grow and 1 was big and filled the shell and may have pipped out on it's own if I had known to float check him. I just learned about that here a few days ago. So now I have about 12 eggs in the incubator starting over. Let's see how they do now that I know a little more. Thanks for all the info though on humidity & temp levels.