Particle Counter Particle Size 0.3 1.0 and 5.0 um Flow Rate 0.1 cfm Relative Humidity Range 20 to 95 Percent Temp Range 41 Degrees to 95 Degrees F Display Backlit Graphical Display Data Storage 1500 Records Number of Channels 3 Count Modes Concentration Counts Interface USB Powered By AC Adapter 110 To 240 V AC 50/60 Hz Or Li-Ion Rechargeable Battery NIST Calibration Certificate