Carbon Dioxide Meter, Calibration Certificate Type Available Separately, Digital Display Screen Type LCD with Backlight, Features 15 Minutes Short-Term Exposure Limit Value, Data Hold, Manually Calibratable, Selectable Display of Dew Point and Wet Bulb, Time-Weighted Average Display for 8 Hr Period, 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