Proactive routine air sampling will detect viable airborne particles and establish typical microbial reference data. The RCS air sampler from Weber Scientific operates on an impaction principle that draws samples at 40 liters per minute with a sampling accuracy of ≤ 2%. This precision allows for quantification of the number of colonies per unit volume of air. Together with standardized, ready-to-use and certified Hycon agar strips, the factory-calibrated RCS air samplers provide a complete system that is fully validated.