Kilns Firing Accessories Ceramics Art Supplies kit has a pyrometer a thermocouple 2 ft of insulated thermocouple wire. components are used to identify the kiln firing chamber temperature. The pyrometer has a dial with markings e50° between 0° 2500°F 0° 1290°C. The thermocouple wire connects the pyrometer to the thermocouple has a 6" probe that fits into the kilns peephole to detect the kiln temperature. Ceramics Kilns Firing Accessories.