Type S Thermocouple
Most all of the kilns that leave are factory are equipped with a Type K thermocouple. Type K thermocouples are accurate and inexpensive. The downside to Type K thermocouples is that they wear out, and they wear out faster when exposed to extreme conditions. Type S thermocouples can virtually last forever. The reason for this is that they are made of platinum which does not degrade under most atmospheres and has an extremely high melting point. This leads us to one of their downsides, they are expensive…BECAUSE THEY ARE MADE OF PLATINUM!!!
They are mostly used in scientific settings where they are constantly exposed to harsh environments like that of a crucible kiln. Because it is made of very expensive Platinum, the wire used to construct the thermocouple is very, very thin. On top of this, it is housed in a fragile high alumina cover. If you hit it with a crucible, it’s game over, so be careful.