Extech CO200 Desktop Indoor Air Quality CO2

CO200 is a Desktop Indoor Air Quality CO₂ Monitor. Measurement ranges are 0 to 9,999 ppm (CO₂), 14 to 140 (-10 to 60) for Air Temperature and 0.1 to 99.9% for Relative Humidity. It features Minimum/Maximum CO₂value recall, Year/Month/Date/Time display, and an Automatic Baseline Calibration (minimum CO₂ level over 7.5 days) or manual calibration in fresh air. Comes with AC adapter and user manual.