Shenzhen WanYi Technology Co., Ltd. is located at Guangming District, Shenzhen, a hi-tech center with convenient transport and very good scenery, with Guangming Center Metro Station nearby. ONETEST Technology was founded in 2011 on the basis of the promulgation of the Law of Indoor Air Quality, the first relevant law in China. Shenzhen ONETEST Technology Co., Ltd. is the integration of research, development, sale, after-sale service and technical development all rolled into one, and it has passed the certification of the ISO9001 Quality Management System, certification of the ISO14001 Environment Management System, and its products have passed certification of CMA and CE, ERP and measurement, etc; and it has drafted corporate standards such as Negative Ion Testers, Radiation Testers, and has participated in the preparation of the Testers of Negative Ions in Air, Observation Methods for Negative Ions in Air, Indoor Comfort Testers, Performance Test Standards for Air Negative Ion Measuring Instruments and other standard. In 2019, the Company was awarded the Certificate as a Hi-tech Enterprise. With years of experience in technologies and services, “ONETEST” and “CESTSEN”, two brands of products under ONETEST Technology have been accepted by a great number of customers in the fields of negative oxygen ion monitoring, radiation online monitoring and air quality testers and gas testers.