Shanghai Jvjing Precision Instrument Manufacturing Co., Ltd. was founded since 1995,Website:http://www.hardnesstool.com, is formerly named instrument department of CAS(Chinese Acadmy of Sciences). Through great efforts in the past 20 years, we create our pround brand SIOMM!  Our professional developing and producing teams have more than 10 years experience. We are specialized in developing, producing and selling Hardness Tester. Our advanced design, skilled manufacturing technology and strong sciences research ability will provide high quality products and high level service to Military and Aerospace Industry, Research Institutions, Universities and Factories.