Different thermometers showing different temperatures.

[Tryingtothinkofaname]

I am incubating chicken eggs for the first time but all of my thermometers are saying different things!

The built in thermometer on the incubator says 37.6 Celsius, the small room thermometer I’ve put inside the incubator says 36.2 degrees. When I put an oral thermometer in through the ventilation hole it currently says 38.9 degrees.
The oral one seems to fluctuate it’s readings anywhere from 36.8-40 degrees ! Depending on when I put it in. But it’s more consistently between 38-39!.
I’m worried I’m going to kill the eggs but I don’t know what thermometer to trust.
Any help would be appreciated.

 

[Justso]

Use a thermometer that you can calibrate. There are some really good articles on byc for instruction on how to do this. Once you have a calibrated thermometer, you'll know if you can trust the built in one.
You'll want to take the temperature at egg level. Not sue where your ventilation hole is. What kind of incubator do you have?

 

[Tryingtothinkofaname]

A Janoel12, the vent is at the top but when I poke the thermometer in it is pretty much at egg level.
The odd thing is that when I first put it in it will read at about 36.7 and then suddenly it will start to climb up to about 38.8! If not higher! I don’t know if that is just the incubator putting out more heat to bring itself back up to the right temperature?