When I was teaching in the schools a couple years ago, the kindergarten teacher would hatch eggs. This was when I knew next to nothing about incubators, hatching, etc...... (as compared to now which isn't much more HA) . I have no idea what kind of incubator she had, I know there was no egg turner, she would do it herself. I think she was going into school on the week-ends to turn them. She would usually get a few to hatch. One year she didn't, she went into the feed store and bought a couple chicks and stuck them in the incubator and told the kids they hatched.
After reading on here all the things that need to be considered, adjusted, and watched, I am surprised she hatched any at all.
I think that is an activity that would stay with the kids for a long time, it would make a big impression. It also allows itself for so many learning activities across the board in all subjects.