The BUCK BioAire Model B520 Bioaerosol Sampling Pump is a compact, lightweight 5-20 LPM controlled flow sampling pump for bioaerosol sampling with Allergenco-D and Air-O-Cell cassettes. The easy, fullcontrol keypad lets you perform unattended time programmed (1, 2, 5, or 10 minute) samples, perform easy calibrations without tools, or perform manual timed sampling at the touch of a button. A group of status LEDs show the BUCK BioAire Model B520 operation at a glance.