Tianjin aidefu Co., Ltd. was established in 2009, located in China, the factory covers 5000 square meters. More than 30 production lines. We export to more than 48 countries. We have a strong R&D team and excellent production capacity. We strive to provide a high level of customer service, competitive pricing, prompt delivery and timely after-sales service. We welcome OEM and ODM. We are a reliable supplier in China. Sincerely hope we can enter the business for mutual benefit! Our products Secondary Current Injection Tester, On Load Switch Test Set, Sfra Test, Ultrasonic Partial Discharge Detector, Protection Relay Testing Equipment, Transformer Ratio Test, Transformer Ratio Tester, Ground Resistance Meter, Earth Resistance Tester, Earth Resistance Meter