I made the "Sex-o-Matic" today (three pieces of wood, a string, and a nail) to play with
@kelseyk idea for sexing eggs/chicks/the wive. My June hatch is on day 13, I did the pin test on each egg and they are still alive after my candling on day 10. The movement was small for each egg, so we retested until it was "clear". Current score, 9 boys and 7 girls. The turner now looks like a Junior High Dance, all the boys on one side and the girls on the other.
I will retest and mark each on lockdown day with a separated hatching tray. The boys will be banded before they are sent home. Time will tell.