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™ cassettes  (also accommodates the Air-O-Cell™ cassette* ). The easy, full-control 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  BioAire™ Model  B520 operation at a glance.  Both an LED and   audible alarm provide confirmation of end-of-sample or depleted battery.  The BioAire™ Model B520 Pump provides a full 5-6 hours of continuous operation (at 15 LPM) from its rechargeable NiMH battery pack.  It comes with a standard smrt charger, which charges the battery pack in 3-4 hours.

 *Air-O-Cell is a trademark of environmental express