Indoor Air Quality Analyzer, Calibration Certificate Type Not Certified, Digital Display Screen Type LCD with Backlight, Features Calculates, Periodically Updates and Displays an 8-Hr, Min/Max Data Recording, Uses a Stable, Non-dispersive Infrared (NDIR) Sensor, Wall or Desktop Mount, Includes Z110VADPT Adaptor, Maximum Carbon Dioxide Measured 5,000 ppm, Maximum Carbon Monoxide Measured 5,000 ppm, Maximum Dew Point Measured 140 Degrees F, Maximum Oxygen Measured Not Applicable