One more bit of advice. I see the temps fluctuate in my incubator quite a bit, read as sometimes as much as 3 degrees of variance. However, I do have a few thermometers in individual boxes scattered throughout my incubator. Even though the ambient air in the entire incubator (walk-in incubator) fluctuates a good bit, the actual temp in the individual egg boxes doesn't fluctuate as much. I think it is a good idea to know the temps in different areas of your incubator.
This is the first year using our new walk-in, so I have been doing some tweaking. I actually had my thermostat set at 88.5 degrees, and found out the temp in most of my boxes was a little low. So, I jumped up the ambient temp on the thermostat to about 89.2, and the egg boxes sit at 88.0 now. Sometimes I think we get hung up on the thermostat being set at the desired temperature, but other events affect what the temperature really is for the desired outcome. Check the temp in the box, where the actual eggs are going to be incubated, and then adjust your equipment to get the temp stable and correct in the box, and not necessarily in the incubator.
Hope that helps,
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