Indoor Air Quality Carbon Dioxide Meter Carbon Dioxide Concentration 0 to 9 999 ppm Temp Range 14 Degrees to 122 Degrees F (-10 Degrees to 50 Degrees C) Relative Humidity Range 10 Percent to 90 Percent Dew Point Range -99.22 Degrees to 118 Degrees F (-72.9 Degrees to 47 Degrees C) Wet Bulb Temperature Range 12.2 Degrees to 118.8 Degrees F (-11 Degrees to 48.2 Degrees C) Humidity Accuracy +/-5 Percent of rdg at 77 Degrees F Resolution 0.1 Degrees Display Dual Backlit LCD