Carbon Dioxide Monitor, Calibration Certificate Type Not Certified, Digital Display Screen Type LCD with Backlight, Features CO2 Automatic Baseline Calibration, Includes Power Adapter, Maximum Carbon Dioxide Measured 9,999 ppm, Maximum Carbon Monoxide Measured Not Applicable, Maximum Dew Point Measured Not Applicable, Maximum Oxygen Measured Not Applicable, Maximum Pressure Measured Not Applicable, Maximum Relative Humidity Measured 90 Percent, Maximum Temperature Measured 122 Degrees F