iGS-220 CO2/RH/Temperature Smart ControllerSophisticated controller for experienced growers Output 1 (bottom) for CO2 enrichment or CO2 ventilation control Output 2 (top) for temperature or humidity control Displays CO2, temperature and relative humidity values Smart automatic self adjustment of operation differential to keep conditions closest to set points Can shut off another equipment while CO2 enrichment is ON, or the other way around 24 hour data log of values 120V, 15 A, 2 HP total load