I have done this in the past. I had it wrong tho and threw the floaters in the woods... shheeeesshhh!! They will float and bob around if there is someone in there. But don't throw them out if it doesn't bobble because sometimes they don't move, just like a babe in the womb. And be sure to use warm water, as warm as the incubator because you don't want to chill them down. and get them back in the warmth quickly so they don't take a chill. don't wipe them off. I would take a marker and try all eggs and keep track to see how it works. Keep notes and records to check later. I have been wanting a candler but spent all my available cash on incubators and eggs and chick feed. Well, you know. Two nights ago I held my little flashlight up to the egg and cradled it in my fingers so the light couldn't get around it. I got a pretty good look inside that way.
