We are one of the professional Measuring instrument manufacturers in China. Our products are included with gradienters and Variety of level vials, etc. Keeping "technology and sincerity" as guidance , We run strictly in according with Iso90000 quality control system and apply ourselves to researching, developing, producing and selling vials. We have exported our productions to Europe and South American. We accept OEM and ODM project business cooperation. Welcome contact with our factory .