shanghai longway optical instruments co., ltd. is grounded on a mission to be the world’s leading edge Specific Gravity Tester Manufacturer and Exporter. Our product line revolves around biological microscopes,stereo microscopes,digital microscopes,metallurgical microscopes,electronic balance,weighing scales,moisture analyzer,viscometer,digital PH meter,densitometer being manufactured in Shanghai, Shanghai, China. We have established our benchmark as one of the best Private Limited company delivering high end Specific Gravity Tester since 2004.We understand the global demand to access the reviving Specific Gravity Tester and to cope with it our strong workforce leverages on a well developed manufacturing unit boasting 16 Years of export history with generating yearly revenue around US$10 Million - US$50 Million. Our professional enterprise was introduced with initial business capital of US$5 Million, houses first in class technicians and a strong quality management system that helped us capture Below US$1 Million worth export value and Australia,Canada,India,Poland,United Kingdom market share.