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 monoxide with temperature and humidity detection; also includes other IAQ indicators and controllers with Modbus interface such as Ozone and VOC&＃39;s as well as aerosol particles. Our HVAC products includes temperature and humidity transmitters, programmable and non-programmable digital thermostats and humidity controllers with Modbus and Bacnet interface. Especially we can supply customized products to meet your special requirements. As a high level technology company, we have concentrated on R&D at IAQ and HVAC and we are professional supplying high quality products and enough service. Founded in 1999, Tongdy Control Technology is an industry leader who has designed and manufactured high quality IAQ products and HVAC controllers. Our IAQ products includes transmitters/ /controllers of carbon dioxide and carbon monoxide with temperature and humidity detection; also includes other IAQ indicators and controllers with Modbus interface such as Ozone and VOC&＃39;s as well as aerosol particles. Our HVAC products includes temperature and humidity transmitters, programmable and non-programmable digital thermostats and humidity controllers with Modbus and Bacnet interface. Especially we can supply customized products to meet your special requirements in quick and best price. Our above products have been resold and used in European markets, North and South America markets, Gulf areas, Australia, Southeast Asia markets. With more than 14years&＃39; experience in designing and application, we are professional supplying high quality IAQ products and enough service. And now our new building with better resources will help Tongdy to go another new milestone.