TechGrow - T-Micro CO2 ControllerOverview The T Micro CO2 Controller is the smallest CO2 controller from the TechGrow range. This device is by far the best in its category, due to the completely digital technique used during the manufacturing process. You can use the T Micro CO2 Controller in any room. It automatically turns the CO2 source on and off. The external CO2 sensor with light sensor enables automatic switching between day and night settings. General Information The T Micro