Shenzhen Wanyi Technology Co., Ltd. is located in Guangming District of Shenzhen, a high-tech city with convenient transportation and beautiful scenery. Guangming City high-speed railway station is close at hand. Wanyi Technology was founded in 2011, based on the promulgation of the first domestic Indoor Air Quality Law. Shenzhen Wanyi Technology Co., Ltd. set research and development, sales, after-sales, technical consulting in one, has passed the ISO9001 quality management system certification, ISO14001 environmental management system certification, products through the CMA and CE, ERP, measurement certification; And drafted the "negative ion detector" enterprise standard. In 2019, it was awarded the High-tech Enterprise Certificate. Through years of accumulation of technology and service experience, Wanyi Technology's two major brands "ONETEST" and "CESTSEN" products have been recognized by the majority of customers in the field of negative oxygen ion monitoring, dust PM2.5 monitoring and air quality detector, gas detector.