Cracked egg in incubator?

[Jada22]

It’s my first time incubating. Eggs were posted to me, on inspection all looked good I candled a few but saw no cracks so placed them all in the incubator. I’ve been candling one or 2 eggs a day just to check.
Today when candling I noticed one of the eggs is cracked. I think I have candled this egg before but I’m not 100% sure.
Should I candle all the eggs to check for cracks? Im worried that this will cause the incubator to lose too much heat. Should I set a heater near the incubator while candling? Would the eggs be harmed if I took a couple out at a time and set near a heater while candling?

Also I have used 3 different thermometers which are all giving different readings.I don’t know which one to trust. Can anyone recommend a good thermometer?

 

[Silexian]

I only candle eggs 2 times during incubation. Usually day 7 and day 15. The eggs will not cool off instantly, so you can candle all of them at one time. Without worry of them getting chilled. I use Thermco thermometers. They are very pricey, but they are accurate.

 

[Tonyroo]

When candling, it's important to candle all of them to know they are progressing. Most people candle on day 6, 12, and 18.

If you clearly see a crack on the shell, it's generally advised to toss it.
Due to potential bacteria forming on and in the egg and spreading to the other eggs.

 

[Tonyroo]

Don't worry about heat loss in the egg when candling, the hatching egg would experience a cooling off from the mother hen stepping away to poop, eat, and drink.

Try to track of there development.

 

[Jada22]

I only candle eggs 2 times during incubation. Usually day 7 and day 15. The eggs will not cool off instantly, so you can candle all of them at one time. Without worry of them getting chilled. I use Thermco thermometers. They are very pricey, but they are

Thank you. Is there a certain type of their thermometers that are good or the brand in general?

 

[Jada22]

When candling, it's important to candle all of them to know they are progressing. Most people candle on day 6, 12, and 18.

If you clearly see a crack on the shell, it's generally advised to toss it.
Due to potential bacteria forming on and in the egg and spreading to the other eggs.

Thank you,
2 have cracks, they’re only visible when candling. I was considering keeping on to them a little longer to see how they go or to see how it would look if an egg goes “bad”. Would I be better to just toss them? I’m wondering if I would know the egg is “bad” and going to cause damage before it is too late or would it not be noticeable and the other eggs would be damaged before I remove them? I’m unsure if they were damaged while being posted or while in the incubator but I’m only on day 2 (in total they have been in the incubator for 54 hours) the 2 with cracks look the same as the others.

 

[Tonyroo]

Visible cracks will lead to rotten eggs, holding on to the egg will create a breeding ground for bacteria. In an enclosed environment it will devastate all healthy eggs.

But if you want to experiment with it I suppose you can choose to see for yourself.

 

[pennyJo1960]

Use invisiable nail polish on the egg Gorrila glue or tape is good for the incubator ?

 

[Tonyroo]

All adhesives give off toxic fumes. It lingers when humidity is present. But that will have to be your choice in using it.

 

[raingarden]

Thermometer

Sometimes aan egg will crack when it is getting ready to explode.

I'm terrible at candling. This is the gizmo. Maybe the light isn't strong enough or something.