I have this same one too. I had to set the digital at 103 to get it to actually stay at 99-100 at the top of the eggs. I use one of the thermometers that she has inside the bator and that is the one I rely on most. I have used it for several other bators and it is the most consistent the built in ones just seem way off to me.Haha mine is that exact incubator too!