Hand-Held Carbon Dioxide Meter Carbon Dioxide Concentration 0 to 9999 ppm Temp Range 14 Degrees to 140 Degrees F Relative Humidity Range 0 to 95 Percent Dew Point Range -4 to 139.8F Wet Bulb Temperature Range 24.8 Degrees to 139.8 Degrees F Humidity Accuracy +/-3 Percent (@25 Degrees C 10 to 90 Percent) +/-5 Percent for Other RH Ranges Accuracy +/-30 ppm +/-5 Percent of Reading Display Triple Line LCD Auto Power Off Yes Low Battery Indicator Yes Data Hold Yes Data Storage Yes