FIRING (6) Heat checking in pottery.
ca: COCCIÓ (6) Comprovació de calor en ceràmica.
es: COCCIÓN (6) Comprobación de calor.
For heat checking: there are many different instruments, pyrometers. Thermocouples, etc., that can be purchased, which allow you to know the actual temperature of your kiln. Pyrometric Cones should be placed in different parts of the kiln to measure the heat. If one collapses more, it implies that that part of the kiln is hotter.