SinoTech company is especially professionalized in the field of optical instruments. For your choice ,we provide many series of refractometers both of traditional and digital and
a varity of gemological instruments such as gemological refractometer,spectroscope, polariscope, dichroscope, chelsea filter, gem magnifier , gem Gauge with favorable prices. Apart from that, we are also manufacturer of scientific instruments with high precision for your service, such as borescope, PH meter ,polarimeter thermometer,to name only a few. You are most welcome to visit our website at Sinoptics Refractometer to find out more.