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A thermal resistor is the most commonly used temperature sensor in medium and low temperature ranges. Thermistor temperature measurement is based on the property that the resistance value of a metal conductor increases as the temperature rises. Its main features are high measurement accuracy and stable performance. Among them, platinum thermoresistors have the highest measurement accuracy; they are not only widely used in industrial temperature measurement but also made into standard reference instruments. Thermal resistors are mostly made of pure metal materials; platinum and copper are the most commonly used ones at present. In addition, materials such as nickel, manganese, and rhodium are now being used to manufacture thermal resistors. There are various types of temperature-sensing materials commonly used in metal thermal resistors, with platinum wire being the most widely used. In addition to platinum wire, metal thermoresistive materials used for industrial measurements include copper, nickel, iron, and iron-nickel. Name, Model (Code), Division Number, Temperature Measurement Range (°C), Allowable Deviation (°C): Nickel-Chromium-Nickel-Silicon WRNK0—1200±2.5 or 0.75%︱t︱; Nickel-Chromium-Copper-Nickel WREE0—900±2.5 or 0.75%︱t︱; Platinum-Rhodium 10-Platinum WRPS0—1600±1.5 or 0.25%︱t︱; Platinum-Rhodium 30-Platinum-Rhodium 6 WRRB600—1700±1.5 or 0.25%︱t︱; Copper-Copper-Nickel WRCT-40—350±1.0 or 0.75%︱t︱; Iron-Copper-Nickel WRFJ-40—750±2.5 or 0.75%︱t︱