you can see how accurate your thermometers are by putting them in salty ice water. Not sure 9 the specifics, but I'm sure you could Google it?Mi incubator has 2 thermometers in it. The one that came with it is reading 98 and the other is reading 102. How do I know the correct temp? Also when hatching ducks, do I keep the 1 vent open for the first 25 days...is a Hova Bator forced air model? Any input would be greatly appreciated.