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Extech CO220: Desktop Indoor Air Quality CO2 MonitorMeasures Carbon Dioxide (CO2), Air Temperature and HumidityFeatures:
Measures Carbon Dioxide (CO2), Air Temperature and Humidity, plus calculates Dew Point and Wet BulbMaintenance free NDIR (non-dispersive infrared) CO2 sensorCarbon Dioxide reading displayed in ppm with six facial icons indicating indoor quality levelsCalculates Dew Point and Wet Bulb valuesCalculates statistical weighted averages of TWA (8 hour Time Weighted Average) and STEL (15 minute Short Term Exposure Limit)Automatic Baseline Calibration functionAudible High/Low alarmDisplays Year, Month, Day, and TimeManually store/recall 99 readingsComplete with AC adaptor | 
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