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Shanghai Heguan Instrument Co., Ltd. is a company specializing in the manufacturing of instruments and equipment for food quality and food safety. After several years of effort, it has obtained multiple invention patents and numerous honors. In 2022, it was recognized as a Shanghai High-Tech Enterprise and the leading unit in drafting the first group standard for food sulfur dioxide detectors in China. The company has established a strong reputation in the market and, more importantly, has gathered a team of talents in technical development, management, and marketing, laying a solid foundation for future development. The company currently specializes in producing fully automatic Kjeldahl nitrogen analyzers, automatic Kjeldahl nitrogen analyzers, infrared digesters, sulfur dioxide detectors, soil cation exchange capacity detectors, microplate readers, plate washers, Karl Fischer moisture analyzers, and other laboratory analysis equipment. After a technological novelty search conducted by the Shanghai Science and Technology Novelty Search Center of the Chinese Academy of Sciences on several technologies of the sulfur dioxide detector produced by Shanghai Heguan, the conclusion was: the comprehensive technology of this project has reached a domestically leading level and possesses novelty. The Kjeldahl nitrogen analyzer produced by Shanghai Heguan has undergone various comparative experiments in different fields, with recovery rates and repeatability receiving high recognition from experts, achieving breakthroughs in industry technology in certain aspects. Shanghai Heguan Instrument adheres to the mission: "Your dissatisfaction is the driving force for our development." With persistence, we develop the spirit of craftsmanship, meticulously refining every component of instruments such as the nitrogen analyzer, and conducting in-depth research into application fields, playing a leading role in the entire industry. We hope our efforts can provide a helping hand to our customers and bring glory to our nation!