The Matador CO2 Controller monitors and controls CO2 levels in the range of 0 to 4000 ppm, with 1500 ppm being optimal for your plants.
Mount 5 feet above the ground and do not mount near air disturbances such as doors, fans or air diffusers. A photocell ensures that you are not injecting CO2 in the dark cycle, as plants like oxygen when they are sleeping.
Auto calibration makes using this controller easier to set up than other models.