Thermocouple and thermal resistance for the range -200 ~ 1600 ℃, the most common contact is simple and reliable temperature sensors. It is usually associated with display, record and adjust the instruments supporting the use of the liquid used in industrial processes, steam, and gas and solid surface temperature measurements. Thermocouple and thermal resistance measurement device according to the structure, fabricated and can be divided into two categories sheathed. As the lead assembly type thermocouple poor vibration, component vulnerability to pollution, stability is not good, easily damaged, so the foreign countries have the basic need, it is generally reserved for the precious metal thermocouple temperature measurements; armored structure is the temperature measurement devices, insulating materials (generally of high purity magnesium oxide powder) and the metal casing drawn by the formation of three solid entity, it has a small diameter, flexible, high pressure, high vibration and fast thermal response etc., is the wide range of international adoption and promotion of advanced technology. First, the measuring range: Thermocouple: K (-50 ~ 1300 ℃), S (-50 ~ 1700 ℃), R (-50 ~ 1650), T (-200 ~ 350 ℃), E (0 ~ 800 ℃), J (0 ~ 1000 ℃), B (300 ~ 1800 ℃), N (0 ~ 1300 ℃), Wre325 (0 ~ 2300 ℃) Thermal resistance: Cu50 (-50 ~ 150 ℃), Pt100 (-200 ~ 600 ℃)