Environmental Particle Counter Particle Size 0.3 0.5 1.0 2.5 5.0 and 10 um Flow Rate 2.83 lpm Relative Humidity Range 0 to 100 PercentRH Concentration Range 5 Percent @ 2 000 000 particles per cu ft Sensitivity 0.3 um Temp Range 32 to 122 Degrees F Display 2.8 in TFT Color LCD Data Storage 5000 Number of Channels 6 Sample Time 3 to 60 sec Count Modes Concentration Cumulative Differential Interface USB Powered By 7.4V Rechargeable Battery AC Adapter