AC Infinity CO2 Regulator, Carbon Dioxide Monitor with Solenoid Valve and Gas Flow MeterDescription Gas Release System: Designed to help foster the ideal grow environment by managing the output of CO2 into the air. This system enables precise control of CO2 emissions, thereby potentially improving the growth rate of your plants. Carbon Dioxide Meter with Pressure Gauge: Accurately monitors gas flow and remaining CO2 tank levels, giving you critical information that can be used to fine tune the settings for optimal growth conditions.