Zhengzhou Yuelong Electronic Technology Co., ltd is located in National University Science Park, High-Tech Zone, Zhengzhou City, Henan Province, China and enjoys charming environment and convenient transportation. Our company specializes in research, development, production and sales of water purifier circuit board, power adapter and TDS water quality tester. Adhering to the concept of the highest quality, the lowest price, the most efficient function and the best service, we are committed to providing all customers with the high-quality products. Our company owns a strong R