3North industry co ltd started in 1996, localed in Shanghai, face to the oversea and mainland. 3 North is a high tech company, specialized in delelopment manufacture and sales the network peripheral product and the computer peripheral product and USB novelty gift. Our main product is network cable tester. The network cable tester is an absolutely necessary tool for installation and inspection during the didtributing the network lines. We have ten varietied nearly, they can adapt for ...