How can you tell which are female or male chicks before you set eggs in ecabator?

Answers:
You can't tell until after they are hatched.They have professional people trained at hatchery's to check the vents on fresh hatched chicks but are still like 80 to 90% accurate.Otherwise you have to wait to see who's comb color turns red first,or saddle feathers are pointed usually in most chickens pointed is rooster and rounded is hen .Also little roosters well act like little roosters,they are more cocky , more aggressive,and hens are more passive.

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In a dark room, place a lit candle behind the shell. You will be able to see the developing chicken. The males are the ones with the blue veined throbbers.

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There is no way to tell, and I assume you're putting them in an "incubator."

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Sorry, but there isn't any way to tell.

There are trained professionals who can basically look up the chick's vent when they are day old and work out what gender they are, but it's very hard to do, and only 90% successful.

The rest of us have to wait for several weeks after the chick has hatched and look for the secondary sex characteristics - comb and wattle size (bigger for roosters), the shape of the tail feathers (pointy for roosters, round for hens, with a few breed exceptions, e.g. sebrights) and crowing (roosters only).

If you can work out a way to tell what gender the chicks are before they hatch then you'll be a very rich person!

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Break the egg open, find the "germ", which is a small cluster of embryonic cells, extract some DNA, and analyze it for the sex. Of course the egg will be scrambled at this point, but other than that there is no way to know.