Ecotechnics Unis CO2 ControllerUser friendly CO2 Controller that s well priced and very reliable. The Unis C02 Controller is really simple to set up and use, you simply dial in the grow room size on your Unis Controller, connect up the regulator to your gas bottle. Easy to use Long term reliability 16 settings One simple calculation your room size No need to adjust Low cost Gas remaining gauge The Unis CO2 Controller has been designed with the latest state of the art microprocessor