New CO2 monitoring system for green houses, as well as for growth chambers and soil respiration monitoring. It can monitor up to 7 different inputs at once, and has 2 configurable outputs. Resolution is 1 ppm for CO2 and 1% relative humidity for H2O. The measurement range is 0-2000 ppm for CO2 , and 0-100% for H2O. The instrument has a flow rate pump that is capable of flow rates up to 500cc/min.  Atmospheric pressure is measured from 600-1,100 mbars to an accuracy of -4/+2 mbars. Alarms are configurable. The instrument has an auto-zero capability for the infrared gas analyzer, and the time between auto-zeroing calibrations is configurable for optimal accuracy. A battery back up can run for up to 5 hours in emergency situations.