Manufacturer of electrochemical sensors (pH, ORP and ISE) for use in water, pools, food/dairy, mining and industrial applications. Also distributor of pH, ORP, conductivity and Ion meters, as well as hand held photometers for water testing. A wide range of test strips and water testing kits are also available.

Shanghai Longway Optical Instruments Co., Ltd. is one of the professional enterprises of developing, manufacturing and selling optical microscopes in China.Since establishment in 1978, we obtained abundant experience of designing, production and management of microscopes, which form a complete system of quality control. In 1993, we obtained the Export License for Machinery and Electrical Products from the government. In 2000, we passed ISO9002 quality system. In 2001, our company was awarded with CE certificate, and in 2004 with ISO9001 certificate. We are looking forward to cooperating with both domestic and abroad customers and friends for a brilliant future.