Type K thermocouples are the most common type of thermocouples used in electric kilns. These thermocouples are purchased in bulk directly from the factory to save you money. The manufacturer is ISO/IEC 17025 certified. This thermocouple is interchangeable with Tuckers/Coneart part number KPT0030 and fits current model Coneart kilns. Total length is 8" and the diameter is .46" to fit in a .5" diameter hole.