Exquisite skills originate from concentration and determination, and from careful study of the essence. With years of experience and keen sense, people can see, hear and touch. Pan Congming, a craftsman from a large country, and Liu Zhenyuan, a technical expert from Gansu Province, have developed an observation power almost as accurate as that of instrument measurement, and provided a convenient and efficient solution for adjusting production control parameters while improving efficiency. @Jinchuan Group Co., Ltd