Skutt Thermo Couple 1515

6 inch thermocouples are ideal and interchangeable with most kilns.
Skutt Part # 1515

Thermocouples are made of two types of wire. The temperature is read from the thermocouple probe's tip that is inside the kiln and where the two different wires meet.  The length of the thermocouple will be determined by the thickness of your kiln walls.