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.
- Measures CO₂ (0–9,999 ppm), temperature (14–140°F), and humidity (0.1–99.9% RH)
- Calculates Dew Point, Wet Bulb, lps% (liters/sec per person), and cfm/p (cubic ft/min per person)
- Tracks 8-hour Time Weighted Average (TWA) and 15-minute Short Term Exposure Limit (STEL)
- Six expressive facial icons visually indicate air quality levels in real time
- Audible and visual high/low CO₂ alarms with user-defined thresholds
- Automatic Baseline Calibration (ABC) for long-term sensor stability
- Stores and recalls up to 99 manual readings
- Large LCD with date/time display (year/month/day/hour)
- Powered by included universal AC adapter