Indoor Air Quality Analyzer Carbon Monoxide Measurement Range (PPM) 0 to 1000 Carbon Dioxide Concentration 0 to 4000 ppm Temp Range 32 Degrees to 122 Degrees F Relative Humidity Range 5 Percent to 95 Percent Dew Point Range -13.5 Degrees to 120.1 Degrees F Wet Bulb Temperature Range -6.9 Degrees to 122.1 Degrees F Oxygen Concentration 0 Percent to 30 Percent Display LCD Auto Power Off Yes Low Battery Indicator Yes Sensor Life 2 yr Data Hold Yes Data Storage Yes