I have 6 different thermometers in my little giant still air incubator. They are all saying different temps 99.0, 95.0, 101.3, 99.1, 96.0, 99.5. Which one is right???? :|
Sounds like your in the ball park on your temp. I think perhaps you are trying to overthink the whole thing. If you have a good quality digital I'd just use that one and take the rest out because you are just going to drive yourself nuts!
The problem with still air incubators is the temp reading is different in various locations inside the bator. Unless every thermometer is in the exact location, the readings will be different.
I'd start with tossing the ones that read low (95 and 96). The rest are closer. Pick 2 that are closest together and put them in the same location right next to each other. The part of the thermometer that is reading the temp should be at egg height level.