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well I keep it at 99.5 and I used 2 thermometers one being the glass mercury style that comes with the incubator and a digital one that also tells me the humidity as well. But I guess maybe I need a 3rd one to check the glass one, because I know my digital one is a little off according to the glass one and my husbands laser temperature gun he uses to check the heat on tires and other semi parts. When the digital one says its 97 according to the glass thermometer it's 99.5 and the laser temp gun says 100. But maybe I should just get me a second glass thermometer and see What it says.IMHO, if there isn't an external pip (break in the shell), it's up to the embryo/chick. At day 22, it may mean the temperature was a bit low during the whole time. I wouldn't try to do anything special until you have more progress.
ok thanks so much I'll definitely get me one of each of these for future use.Egg size can affect the time it takes to hatch. It's best to incubate like size eggs together.
Generally speaking, early hatch indicates higher temp during incubation. Late hatch indicates lower temp.
I always had problems and the mercury one that came from an incubator company proved to be wrong.
I bought a brinsea spot check but didn't trust it because it was so far off from the others.
Then I bought a thermoworks fast read guaranteed to be accurate to ±0.9°F. It turns out it agreed exactly with the brinsea spot check so those are the only 2 I trust now.
The spot check is accurate to ±0.2°F.
Almost all other thermometers are supposed to be accurate to ±2°F which is too far off for incubating if it were true but I've found some off by as much as 5F.
http://thermoworks.com/products/low_cost/rt301wa.html
https://www.brinsea.com/p-394-spot-check-digital-incubator-thermometer.aspx