Tongdy Control Technology has designed and manufactured high quality IAQ products and HVAC controllers for 12 years. 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's as well as aerosol particles. Our HVAC products includes temperature and humidity transmitters, programmable and non-programmable digital thermostats and ...   |