The type K is commonly found in nuclear applications because of its relative radiation hardness.
Type K Thermocouple (Nickel-Chromium / Nickel-Alumel).
The type K is the most common type of thermocouple.
Maximum continuous temperature is around 1,100C.
Consideration for bare wire type K thermocouple application.
It’s inexpensive, accurate, reliable, and has a wide temperature range
Type K Thermocouple Operation Manual, Lab Instructor Guide and Student Workbook. Type K Thermocouple for Educational Vocational, Didactic Technical Training Equipment Labs.