I just put my 42 eggs in lock down....14 are shipped eggs. I don't know about the development because I can't see into most of them. Only the air cell and it seems good on all of them. I am so discuraged though about the humidimeters. I have one on the genises 1588 and two I have bought. They are all different readings. I did the calibration on the timex and it was 72.....so I added two %. Then I bought that has a senser that I can put through a hole and tried to calibrate it and it was way off. Like 64 or something. I just quit after that. The genises is another reading too. I am just tired of trying to figure it out. The one with the senser was recommended to me as being fairly accurate. hmmmmm. I did the salt water calibration. It didn't get close to being 70 even. I just added some water and the genises is reading 35 the senser it reading 41 and I just put the timex in and it is reading 75 but it hasn't been in there very long. I will wait a couple of hrs and read them all again. It is very frustrating. You would think that at least two would be close. I am just about to throw them away and go by the genises and hope for the best..