STS is a professional technical services institution with the spirit of "customer first, honesty first" principle, Not only do we have in touch with the quality supervision sectors, cement, chemicals, food, cosmetics, metrology and other related associations and technical institutions for training services and cooperation; long-term commitment to carry out technical advisory services, vocational skills training in the above related industries and enterprises in other comprehensive service support. Please contact us! wechat:STS29805428