I check as many spots as I can, and adjust to the average of all those temperatures. I keep both of my Advances set at 100.0Using my brinsea 20 Eco for the first time. I have had the mini advance for years. I love it but it is too small. I also have a Janoel 24 (yes, I have an small addiction problem ) that I really like. The Eco is driving me nuts. There is so much temperature variation. I keep messing with it, trying to find a balance. Right now I am at 99.5 on the brinsea, 100.2 with the incu therm in the middle of the incubator and 98.8 in the corner of the incubator. Is this "normal" for the Eco 20? This is bring back memories of my first incubator which was a styrofoam and it was awful.
Because it is a brinsea, I went ahead and put eggs in it. At least they are not expensive eggs.