Tianjin Shengwei Development of Science Co., Ltd. is a high-technology company registered in Tianjin Science and Technology Property Area, which works on the development, manufacture and sales of high technological products in the fields of public traffic, environmental protection and multimedia electronics. In Shengwei, there are 5 postgraduates, 3 higher engineers and many bachelors, and personnel's average age is in the range of 24-45 years old. Our company is a leader in the field of automobile repair and analysis in China and has undertaken several technical researches of the state. Many of them have reached a high level approved by the state ministry. Tail gas analyzing devices, like tail gas analyzers and smoke meters are capable for traffic and police testing station, tail gas treatment station, auto manufacture factory, auto repair factory as well as other maintenance departments.