Carbon Monoxide Detector, Calibration Certificate Type Not Certified, Digital Display Screen Type LCD with Backlight, Features Adjustable Audible Alarm, Automatic Calibration in Clean Air, Includes Case, Wrist Strap, Maximum Carbon Dioxide Measured Not Applicable, Maximum Carbon Monoxide Measured 1,000 ppm, Maximum Dew Point Measured Not Applicable, Maximum Oxygen Measured Not Applicable, Maximum Pressure Measured Not Applicable, Maximum Relative Humidity Measured Not Applicable