Turkeys incubate at the same temps and humidity as chicken eggs. One major difference is the duration. Theirs are 28 days. So incubate at 99.5 with 45 to 55% humidity for 25 days turning at least 3 times per day minimum. (always turn an odd number of times each day ie: 3,5 ect...) Stop turning at day 25 and raise humidity to 65 to 75%..... they will hatch at or near day 28 +or- 2 days . Some may debate this but I found that if you open the incubator and let the eggs air out for about 15 minutes a day I got much better hatches ( don't worry about the eggs cooling down too much during the 15 minutes) Just a word of caution if this is the first egg your hen has laid it is likely not fertile.
The air cell will start to develop within hours. Just take the egg in a dark room and shine a flashlight into the egg. The air cell should be clearly visible. If you are going to incubate in a carton place the egg large end up or if you cannot tell which end is the large end put the air cell up. If you are laying them on their side to incubate just lay them on their side with the smaller end lower than the bigger end.
Good luck and happy hatching
