Indoor Air Quality Tester; Calibration Certificate Type NIST; Digital Display Screen Type LCD; Includes Calibration Cap; Carrying Case; Connection Tube; Meter; Probe; Probe Stand; RS-232C Cable; USB to Serial Adapter; Maximum Carbon Dioxide Measured 5;000 ppm; Maximum Carbon Monoxide Measured 500 ppm; Maximum Relative Humidity Measured 98 Percent; Maximum Temperature Measured 140 Degrees F; Minimum Carbon Dioxide Measured 0 ppm; Minimum Carbon Monoxide Measured 0 ppm