Reed Instruments Indoor Air Quality Analyzer,LCD R9910SD

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