In the past I have used hovabators and had the probe inside the tub with the eggs, along with a thermometer in there with them, and a thermometer outside. Our setup is different this year since we are currently using the freezer part of a fridge. Since there are holes drilled in the fridge for the probes to go through and not a lot of cord, we have a helix probe sticking in one side, a big apple stat probe in the other. The helix is plugged into the big apple as fail safe. We went out and bought a remote digital thermometer to give us an idea of temp in the bator since it is out in a shed like area and I also have thermometers all around in various parts of the bator. I dont have a single thermometer in the tub this year. Good idea for a hovabator, I just dont feel it is needed with this setup as everything is sealed well and I have 6 thermometers all around in there.

But, this is my first year doing it this way so it may not work, we will see. So far everything seems to be going okay though. I will let you know in about 30 days if my eggs hatch or not. Lol.