CO2 monitor used for enhancing grow room growth rates. Normal growth is 350-800ppm CO2. Faster growth above 1000ppm and ideal is 1500 for max growth. 2000 or above will slow a plant.

• Typically used with Exhale or other CO2 bags to increase CO2 levels.
• To stop CO2 escaping, only use fans during a night cycle.
• Ideally, use Air conditioning to control heat. 
• Make sure you take into account temperature when sealing a room for CO2.
• Some benefit may be achieved with a grow room that doesn't get hot, such as an LED grow light setup or an Air-cooled/cool tube setup. In these situations keeping co2 above 1000ppm may need some extra co2 bags as the cooling/exhaust fans are removing co2, as well as heat,
• put a flap over the intake fan when not turning or co2 will leak out this vent. A plastic bag that drops down when the fan isn't blowing air will work well.
• CO2 is a heavy gas so leaks usually happen down low. Mixing circulation fans is good for keeping co2 up in the canopy