* Checks for Carbon Dioxide (CO2) concentrations with Max/Min value recall function.
* Maintenance free NDIR (non-dispersive infrared) CO2 sensor.
* Indoor Air Quality displayed in ppm with Good (380 to 420ppm), Normal (<1000ppm), Poor (>1000ppm) indication.
* Visible and Audible CO2 warning alarm with relay output for ventilation control.
* Measurement ranges:
CO2 : 0 to 9,999ppm
Temperature: 14 to 140°F (-10 to 60°C)
Humidity : 0.1 to 99.9%RH
* Displays Year, Month, Date, and Time.
* Automatic Baseline Calibration (minimum CO2 level over 7.5 days) or manual calibration in fresh air.
* A Quality product from Extech, USA.
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