Precise and Reliable Temperature Measurement is CRITICAL Particularly in High Temperature (eg. 1200°C to 1500°C) Processes like Steel / Metallurgical / Glass / Ceramic etc. Periodic Calibration of the High Temperature Sensors used for such Measurements is Essential to Counter the Effect of Ageing and Drift. Article Describes Innovative Techniques of Achieving Fast, Reliable and Accurate Calibration of these High Temperature Sensors.