Thermocouple (temperature sensor), K-type, 1/4 diameter, exposed tip 14-gauge complete with beads, ceramic block and lead wires for 3 1/2 – 4 1/2 wall kilns. (Order the PY81-5 if you do not need to replace the ceramic block or lead wires.) Our beaded thermocouple with polished tip is rugged and reliable. The thermocouple is made in the U.S. with American-made components to exacting standards. The special limit thermocouple wire is certified to be close tolerance.