As far as I know, thermocouples are widely used. The same product is used in different industries, and the measurement accuracy and service life are far from each other. Each manufacturer's customer base is different, and its technical emphasis is also different. In the petrochemical industry, Chuanyi 17, Xi Andinghua and Zhejiang Lunte all have good achievements. Among the non-ferrous metals, electrolytic aluminum and carbon industries, the product quality of Foshan Shenzhen-Hong Kong, Shanghai idy and Shenyang Dongda is the most outstanding, the glass-ceramic cement industry is dominated by Tiankang, Guo Xin, Shenzhen-Hong Kong and Chuanyi, and the thermal power generation industry is dominated by Chuanyi 17, Tiankang, Guo Xin and Shanghai. Coal chemical industry is mainly based on the quality of Tianjin Zhonghuan, Zhejiang Lunte, Xi Andinghua and Chuanyi 17. In light industry and food industry, brands such as Jiumao, Yang Min and Omega occupy the market with exquisite workmanship.