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Grozone Usco2 Controller Nutrient Kits all year long all year long Better Flowers User can select one among five preset CO2 control values (1000 7000 feet)Detailed description 3 LED Display shows ambient CO2 value (7 ranges between 500 and 2000 PPM) Day Night detection to turn off CO2 enrichment during the night One button calibration in fresh air (400 PPM) 5 Amps Output (for CO2 burner valve or regulator coil)
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