Shanghai Yidian Physical Optical Instrument Co., Ltd. was founded in 1951 and has a long history of nearly 70 years. It has developed into an integrated supplier and manufacturing base of physical optical instrument system integrating R&D, manufacturing, application services and overall solutions. The company now has 10 series of polarimeter, melting point meter, refractometer, fog meter, colorimeter, laser particle size analyzer, turbidity meter, stress meter and more than 100 kinds of professional physical optical instrument products.