I have a Hovabator still air. I am just in my early days of my 2nd hatch. I got 4 out of my first hatch. Not great but it was a learning experience. So now I have just started my second one. I added a 4 inch personal fan today. I don't know for sure on the temps. I had my digital out of the bator for awhile so I was just going off the one that came with the incubator. It went way high so I opened the bator to cool it down and then it leveled out. So now I have added my digital back in it and there is a big difference between the digital and the one that came with the bator. What one do I believe?