I weigh eggs. Make yourself a spreadsheet, and weigh the eggs when they are set. You are expecting the eggs to lose 0.65% of their weight per day, so you multiply that times the number of days (with the day you set being Day 0 unless you set early in the morning) to get expected % weight loss.
Then, when you weigh at candling, you calculate:
[1 - (set weight/current weight)] x 100 = percent weight lost.
You compare that to expected.
I have been tweaking my spreadsheet (one I got from someone else and then modified) this hatching season to make it easier with formulas embedded. Remind me later and I'll clean it up and share so you can enter and it will calculate for you.
Turn a minimum of 3 times a day. People say more is better, but if you have to open the incubator to turn, that's a down side to that. I just turn before work (~7-8) after work (~5-6), and late at bedtime (~11)..
Sally says to start at 30-35% - I have found that that is indeed a good place to start (as have others). Then on Day 7 you can see where you are and go from there.
- Ant Farm
And now I understand the crazy eyes!!
on the rooster not you...
That is way to anal for me. I am not a detail person. I would love to have you do that to my eggs for me. Just for the fun of it.
I find the more times I touch the egg, the more chances it has to bounce off the floor. Most eggs do not survive the first bounce...and clear fingernail polish does not always seal the cracks....specially if the yolk is leaking out.

