In a still air incubator I have a digital thermometer that reads indoor temp and has a sensor that reads outdoor temp which I also have mounted inside the incubator. The outdoor temp is reading 99 but the indoor temp is reading 103. I put another digital thermometer inside the incubator and it is reading 100. 99, 100, 103 which on is right? 103 is to hot but 99 or 100 would be good. I don't want to harm the eggs when I put them in.