Available for both models, the Hepa Filter can be added as an extra precautionary measure to prevent carbon particles produced from the vacuum pump from escaping into the environment being monitored.
For sampling specific areas such as "point of fill" or laminar flow cabinets.  Equipped with 8' of Tygon tubing and screw on remote probe cap.   For Model 220 only.				Four interchangeable petri dish drive motors are available with one revolution per 60-min, 30-min, 15-min, & 5-min.  This adjusts the sensitivity to the expected concentration of airborne organisms.