It is a thermostat, I'm sorry for the confusion. Hmm I see, I did not know it's supposed to be outside the glass in between the UTH, I'm gonna have to fix that today. Thank you for the info.
The thing is my thermometers do NOT have a probe to them nor can I find one for sale that does have a probe. So is it possible for me to use thermometers for inside the tank without a probe? I don't want to spend 100+ on one with a probe.