What type of temperature sensor is this?

[MrOmnos]

So, a 3D printer at our school is having issues with hot bed temperature. It is just showing random temperatures. Sometimes it shows 300C but when you touch the board its barely warm. I checked the cables to the temp sensor and they are fine. Also did the continuity test. So, I think the temp sensor needs to checked. I would like to check it with an arduino but I haven't worked such temp sensor before. Looks like some kind of thermo couple. There's also a LM358 on the main board where the temp sensor connects, also a bunch of resistors. So, I assuming it is a resistor bridge and op am set up. But I am not sure. I wanna be sure before I do anything to it because if I break it is gonna take a month to get spare parts and everyone waiting in line to use the printer is gonna get angry. Does anyone know what type is this so I can look up a tutorial and hook it up to my arduino real quick and test it.



the thing on the right is the heating element and one on the left is temp sensor.

[Horusaem]

Why not google the 3D printer you are currently using to try  to get Bill of materials for it ? <--- a Rod

[sokoloff]

It is most likely a thermistor.

Thermocouple would have two different types of wires evident, generally with different color insulation.
A "one wire" sensor would probably have 3 wires (though it can work with only two).

A thermistor in a resistor bridge is the most likely thing here. Looking at the BOM for the printer (if open source) is obviously the best path.