8# Building, #9 Courtyard Dijin Rd. Haidian district

Tongdy Control Technology has designed and manufactured high quality IAQ products and HVAC controllers for 15years. Our IAQ products includes transmitters/ /controllers of carbon dioxide and carbon mo...

Faraday Instruments started off as a leading Manufacturer and Exporter of Ozone Monitor. Since inception, our production facility has marked perfection in terms of quality and reliability of Ozone Mo...