Sino Science & technology Co., Ltd located in Zhangzhou Fujian, established from 2001.It is an emerging high-tech technology enterprise which collection scientific research , production and trade as one.We offer all kinds of optical instrument, measuring tools and testing tools.Including refractometers, PH meters, Gem pocket Scales, Loupes/Magnifier, digital Thermometers, Calipers and Gauge, Fiber inspection tools, Microscopes, all kinds of instruments for gemstones' quick testing, LED ring light for lab using and all kinds of tools for household using.