Candling- why is it important?

I got into a debete with someone about canding. They are saying it's better not to candle because the eggs will get harmed and cold. I was saying that hens leave the nest for up to 10mins anyway so it won't make a difference.
Why is candling important? Should I do it?
Who ever told you that is full of it.
 
I candle. Not as often as I should, and not on a regular date (though I should). Two reasons - one, to remove infertiles/early quits so my incubator doesn't contain potential homes to bacterial surprises next to my developing chicks, and two, to remove those bacterial surprises.

If one is organized, and works with deliberate haste, its not a big deal for the eggs briefly cooling in your 90-some degree fingers as you hold it above a high intensity bulb. I assume most of us don't take our incubator into a walk in cooler to candle, then admire the beauty of our hatching eggs under the cold air return for minutes on end...
 
Candling the eggs in the incubator became a more regular activity when a foul rotten egg smell emerged from the incubator. Yes one can do it with their nose alone, but why wait until bacteria have more than begun to decompose an egg.
 

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