Carbon Dioxide Meter, Calibration Certificate Type Available Separately, Digital Display Screen Type LCD, Features Min/Max Data Recording, Includes Carrying Case, Maximum Carbon Dioxide Measured 9,999 ppm, Maximum Carbon Monoxide Measured Not Applicable, Maximum Dew Point Measured 139.8 Degrees F, Maximum Oxygen Measured Not Applicable, Maximum Pressure Measured Not Applicable, Maximum Relative Humidity Measured 95 Percent, Maximum Temperature Measured 140 Degrees F