Zhengzhou Greatwall Scientific Industrial and Trade Co., Ltd. is a comprehensive company integrating research, development, production and operation together. Since our establishment in April, 1988, our company has developed teaching instruments and equipment including water circulating type multipurpose vacuum pumps, low temperature cooling liquid circulating pumps, low temperature cycling pressure pumps, low temperature (vacuum) pumps, digital-control super low temperature constant temperature slots, chemical reaction experiment devices, digital display direct-current step-less speed adjustment treaters, glass container quick bakers, digital display small vacuum dry boxes, freezing vacuum dry boxes, and electric heaters. Our company enjoys a quite good credit among the same trade in China. We are the first company of passing ISO9001 international quality system authentication. Our projects of the loan from World Bank and Normal Education Development of the Ministry of Education, Development All Over Country, Key Subjects Development, Higher Education Development, and All Over Country have won the bidding in the open tenders in succession. We have been designated as an enterprise paying attention to contract and adhering to the credit of Zhengzhou City for 10 years in succession. We are also an enterprise with fine-quality products' brands Of Henan Province. We have won the title of "Enterprise of Key Quality Following Up" from Technical Supervision Bureau of Henan Province, "Unit with Reliable Quality and Metering" from Technical Supervision Bureau of Zhengzhou City, and "China model enterprise paying attention to Contract and Quality, Adhering to Credit" from China market monitoring center.