The Extech CO270 Air Quality Meter measures CO₂, humidity, dew point, and temperature. Designed for workplaces, schools, warehouses, and healthcare settings. Its easy-to-read display and graphical air quality indicators make interpreting results effortless. The three AAA batteries provide up to one year of continuous operation in ECO mode.
Users can recall peak and average values over the previous 24 hours, set programmable buzzer alerts, and rely on the manual CO₂ calibration feature to maintain long-term accuracy. The CO270 also has anti-theft and anti-modification protections.
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| Relative Humidity | 5.0% to 95% |
|---|---|
| Relative Humidity Basic Accuracy | ±5% |
| Relative Humidity Max Resolution | 0.1% |
| Sampling Rate | LCD updates every 10 seconds (Regular mode) or every 60 seconds |
| Sensor Type | CO2 NDIR (non-dispersive infrared) technology |
| Temperature (Air) | 0°C to 50°C (32°F to 122°F) |
| Temperature (Air) Basic Accuracy | ±0.6°C / ±1°F |
| Temperature (Air) Max Resolution | 0.1°C/°F |
| Certifications | EN 61326-1, IEC 61000-4 |
| Dimensions | 88 x 86 x 25 mm (3.4 x 3.4 x 1 in) |
| IP Rating | IP30 |
| Battery | 3 x AAA (1.5 V) batteries |
| Extech Warranty | 2 years |
| Weight | 115 g (8 oz) |
| Carbon Dioxide [CO2] | 0 to 9999ppm |
| Carbon Dioxide [CO2] Basic Accuracy | ±50 ppm or ±3% of reading |
| Carbon Dioxide [CO2] Max Resolution | 1 ppm |
| Battery Life | Regular mode >6 months. ECO mode >1 year |