Yes, pretty much. Ideally they will be 99 to 99.5, but if you go up or down briefly its no problem. The more eggs or water filled objects to take up space in the incubator, the better it will hold temp without wandering up and down all the time. Remember, don't freak if it moves a bit, but try to keep it at 99. Its the temp INSIDE the eggs thats important. I actually bought a toy called a water weasil (google it) and if you keep it in with your eggs, you can stick a medical thermometer in it, and always know what the temp inside your eggs are based on the temp inside the water weasil. Very useful tool to keep one from stressing too much. If you keep the water weasil temps at 99-99.5, you always know your eggs are ok even if the air temp varies. It takes a little while for air temp changes to change the inside the egg temps.
Hope this helps. Feel free to PM me if you need add'l help as you get closer to hatch. I'm always glad to help.
