Characteristics: Extech CO220 Desktop Indoor Air Quality Monitor for CO2 Displays concentration of CO2 NDIR (non-dispersive infrared) sensor is maintenance free CO2 level displayed in ppm with facial icon illustrations indicating air quality Audible alarm can be set if levels exceeds or falls below user set level Time and date are also displayed Recall function for max/min CO2 level Dew point and Wet bulb values calculated Statistical weighted averag
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