In the fields of industrial production and scientific research, accurate temperature measurement is of crucial importance. As a widely used temperature sensor, the accuracy of thermocouples directly affects the reliability of the entire system. Thermocouple calibration is a key step to ensure that these sensors can provide precise temperature readings. Uncalibrated thermocouples may generate large measurement errors, leading to unstable product quality, deviated experimental results, and even potential safety hazards in some critical industrial processes. For example, in the steel smelting process, a tiny temperature deviation may change the properties of steel. Calibrated thermocouples enable engineers to accurately control the temperature and ensure that the product quality meets the standards. Regular calibration of thermocouples can effectively reduce systematic errors and improve production efficiency, which is an indispensable part of the stable operation of modern industry.