Ya it's a little frustrating only cause im trying so hard to get it right the first time so I get the best chance possible with my first time hatching. I'll cry if I loose all or most of them. I tried to calibrate the new one I just got (with the wire probe) by using one of our digital oral thermometers. I filled a glass of water and sticked them both in there. A couple times they ran up to the same number and a few times the wire probe thermometer was off by a degree. It works alot faster though then the first one I got. I put the new one (with probe) down through the vent whole and dangled it right next to the fatter one I got before, and compared the two and they are very different. I turned up the incubator just to see if the other one would rise and it wont. The new one went up to 105 and the first one I got stayed at 95. So I turned it back down and got the new one to 95 just to see if the other would would drop and is hasent. The humidity is totally off also. The first one is saying 30 and the new one is saying 45. Soo.. I am not sure which is more accurate. I feel more confident with the newer one I got simply because it reads faster then the first one and it read very close to what the oral thermometer does. So would it be safest to try to leave the over all temperature at 100 during the entire incubation to give it a little head room incase it drops a little or raises a little?
I have learned, better to err on the low side than the high side. Hens get off the eggs now and then, and the average temp is not always 99.5, the eggs cool off periodically (the hen never heat spikes though lol)....so i figure if I can get them rolling at 99.5 and it dips down a little here and there I do not worry. My last hatch I ran at 98 after the first 4 days because I was so worried about heat spikes while we were in and out and I got a lot more to hatch than I thought I would. I think about 80 percent, which kind of surprised me. I figured I would lose some but not as many as if it spiked, and instead the hatch was about the same as usual. Super surprised me!

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