I got a new second incubator. It came with a thermometer on top and a mercury thermometer. This one has a circulating air fan. I am getting it ready for eggs being shipped and I want to be sure about the temp. I put in the mercury thermometer as well as a new digital thermometer. The built in one and mercury one agree at about 99-99.5° but the digital reads 95. That's a big difference so I put in another digital as well, the one I hatched my last eggs on. It agreed with the other digital at 95. That makes 2 thermometers reading 99.5 and 2 reading 95. What do I believe?! The last hatch with the second digital thermometer was in my still air incubator so I kept it at 101. I had 17/21 chicks hatch on days 20 and 21. I don't know what to trust. If I believe the digital and crank up the heat and am wrong, I could cook them. I listen to the mercury but am wrong I would be incubating them at 95. Help!!!!!!