The Extech CO220 is a comprehensive indoor air quality (IAQ) monitor that measures carbon dioxide (CO₂), temperature, and relative humidity while calculating dew point, wet bulb temperature, air exchange rates (lps% and cfm/p), and exposure limits (TWA/STEL). Featuring a maintenance-free NDIR CO₂ sensor, six facial icons for intuitive air quality feedback, and user-programmable audible alarms, it’s ideal for schools, offices, hospitals, greenhouses, and industrial environments requiring detailed ventilation and health compliance monitoring.
| CO₂ Range | 0 to 9,999 | 1 | ppm |
| Temperature Range | 14 to 140 | 0.1 | °F / °C |
| Humidity Range | 0.1 to 99.9 | 0.1 | % RH |
| Dew Point Range | -94 to 140 | 0.1 | °F / °C |
| Wet Bulb Range | 14 to 140 | 0.1 | °F / °C |
| lps% Range* | -1428 to 51 | 1 | % |
| cfm/p Range* | -30 to 1 | 1 | cfm/p |
| Sensor Type | NDIR (Non-Dispersive Infrared) | — | — |
| Calibration | Automatic Baseline Calibration (ABC) | — | — |
| Memory | 99 manual readings | — | — |
| Dimensions | 6.1 x 3.4 x 3.2 | — | in (155x87x81mm) |
| Weight | 5.8 | — | oz (165g) |
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The Extech CO220 is a comprehensive indoor air quality (IAQ) monitor that measures carbon dioxide (CO₂), temperature, and relative humidity while calculating dew point, wet bulb temperature, air exchange rates (lps% and cfm/p), and exposure limits (TWA/STEL). Featuring a maintenance-free NDIR CO₂ sensor, six facial icons for intuitive air quality feedback, and user-programmable audible alarms, it’s ideal for schools, offices, hospitals, greenhouses, and industrial environments requiring detailed ventilation and health compliance monitoring.
| CO₂ Range | 0 to 9,999 | 1 | ppm |
| Temperature Range | 14 to 140 | 0.1 | °F / °C |
| Humidity Range | 0.1 to 99.9 | 0.1 | % RH |
| Dew Point Range | -94 to 140 | 0.1 | °F / °C |
| Wet Bulb Range | 14 to 140 | 0.1 | °F / °C |
| lps% Range* | -1428 to 51 | 1 | % |
| cfm/p Range* | -30 to 1 | 1 | cfm/p |
| Sensor Type | NDIR (Non-Dispersive Infrared) | — | — |
| Calibration | Automatic Baseline Calibration (ABC) | — | — |
| Memory | 99 manual readings | — | — |
| Dimensions | 6.1 x 3.4 x 3.2 | — | in (155x87x81mm) |
| Weight | 5.8 | — | oz (165g) |