| Tongdy Control Technology Co., Ltd. Tongdy Control Technology Co., Ltd., founded in 1999, is a leading hi-tech company of manufacture controlling products of HVAC and IAQ in China. Tongdy has passed the authentication of ISO9001from 2002. a. We manufacture and ODM supply digita... We are regularly Selling: co2 humidity temperature compositive controller for agriculture, co2 transmitter, humidity monitor controller, indoor air quality co2 covoco3 monitorcontroller, thermostat for hvac system, thermostat temperature controller, voc detector controller, o3 detector controller. Member since 25 August, 2006, China - Beijing |