Tianjin Grewin was established in 1995 and specialized in the manufacture of monitoring systems ，cable tester，transformer,current transformers and chokes etc. in China.These products widely used in communications,power energy,industrial control,medical equipments etc. After more than 24 years development, we totally have 16 producing lines for transformers and 5 producing lines for monitoring systems.Now we have abtained the CE, ISO9001, CB, SGS and IEC certificates and we have our own brand “GREWIN”. We have established long-term trade relationships with customers from Germany,Russia, Ukraine,USA,Canada,Australia,Brazil,India, Malaysia, Indonesia etc. including more than 100 countries. "Quality and Honesty First” is the business philosophy we always adhere to. We also stick to the management strategy of "product creation, management creation and service creation".Make Grewin known by the world in electrical industry.