I have two aquarium thermometers in my incubator, plus the one that came with it. It's a little styrofoam one, with a plastic outer shell - I think they're new on the market (Pro Series, Model 4200). The one that came with it has read a steay 99.5* pretty much since I set my eggs on March 9. But it sits on top of the eggs, and I had read about the aquarium ones, so I bought two and put one on each side of the incubator, between eggs. They both read the same temp. (about 100*) for several days. Now yesterday, one read 102-104, the other held steady at 100. Thought maybe it was the thermometer, so I switched them. It still read hot on the one side. (My other thermometer was on that side, too, and was up to 101 so I moved that to the cooler side, and it dropped down to 99). So, last night I candled the eggs and the ones on the warmer side were farther developed, so I rotated them to the cool side, and the others to the warmer side. All this to say, I bumped the thermostat down some because I think it's best to have it run a little cooler than warmer and am looking for your opinions. I plan on calling the company today and asking if they will replace either the whole top of the incubator, or at least the heating element if it's easy to replace. My eggs should go into lockdown tomorrow night at 10:30, but due to the slower development may wait until Wed. late afternoon or evening. Any thoughts on that, too?