Shanghai Ren Shi Electronics Co., Ltd.   

The first American manufacturer of portable digital acid-base meters in the world, the first Chinese wholly-owned instrument manufacturer in the world, and thirty years of research and development of water base pH, dissolved oxygen, conductivity and temperature measuring instruments; the average annual R & D and production of new models are more than six models; the three companies in the United States, Taiwan and Shanghai are three multinational companies with a complete distribution network; over 100 kinds of products, covering desktop, industrial and portable; the company has passed ISO 9001 certification; the products are certified by CE and CMC; and domestic (Shanghai) has nine thousand square meters of production plant. ...