Tianjin Grewin Technology Co.,ltd, who always pay great attention to its business philosophy "Quality and Honesty First". We have both design and produce advantages about toroidal transformer,high frequency transformer and current transformer .Depending on continuous and innovative R&D, and efficient management, Grewin has attracted lots of talented people to work together, who provide effective production, accurate inspection testing and excellent sales service for customers.Grewin&＃39;s manufacturing bases is located in Tianjin in China&＃39;s north, which is Grewin&＃39;s for electronic component products and using automated equipment like telephone, computer, air-conditioner and meter equipments etc., the division is operated by engineers who design and build data recorders with reasonable price.Also we have passed ISO9001, CE, SGS ?TUV,ULcertification.