Desktop Indoor Air Quality CO2 Monitor

Extech, CO220, Desktop Indoor Air Quality CO2 Monitor with Air Temperature & Humidity MeasurementsCO220: Desktop Indoor Air Quality CO2 MonitorMeasures Carbon Dioxide (CO2), Air Temperature and HumidityMeasures Carbon Dioxide (CO2), Air Temperature and Humidity, plus calculates Dew Point and Wet Bulb. User settable high/low alarm function is perfect for monitoring air quality and insuring proper air ventilation in conference rooms, schools, greenhouses, factories, hotels, hospitals and anywhere that high levels of carbon dioxide are generated.Includes: Desktop Indoor Air Quality CO2 MonitorAC adapterFeatures: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 readingsCarbon Dioxide (CO2) Concentration LevelsTime Weighted Average exposure Limit <8 Hours.