Changsha Qlong Instruments Co. Ltd . is an excellent supplier specializing in trading and manufacturing . Our main products is spectrophotometers , hardness tester , muffle furnace , and some testing analyzer . (moisture analyzer , balance , calorimeter ) . and so on . With a wide range , good quality , reasonable price , our products are extensively used in environmental , food , teaching research , medical , chemical and nonferrous metallurgy . Qlong have more than 22 years&＃39; experience in domestic business . High quality and best service to customers is our first purpose . We earnestly hope that we will have broad and effective cooperation with people from trade and economic circles all over the world . QLong is the best choice to enjoy mutul benefits .