My LG came with the thermometer stuck to a piece of clear plastic that you lay right on top of the eggs. That may be what you are seeing. Actually, the one that came with the incubator was broken so I just taped a cheap aquarium thermometer to the plastic and it seems to be working fine.
I hope you all threw those 'thermometers' that came with the LG's in the trash, they are pretty much worthless. Walmart sells a thermometer/hygrometer combo made by Springfield for about $6 that works very well.
I have the kind from walmart but I paid 12.00 for 1 with the long deal so you can leave the digital part outside and read it, and the other cost me 8.00 but it sits inside the incubator. But I still like having others for other readings ......my first LG incubator was second hand so it didnt have the original thermometer with it.
This new one did so I wasnt sure what to do with it.