Discover what is in the air you breathe. Particulate matter is deposited on a high efficiency filter as air is drawn through it at a calibrated volumetric flow rate. The total mass in milligrams per cubic meter can be determined. Chemical and radioactive tests can also be performed on the material collected. The unit is 40 cm tall and operates on standard 115 VAC 60 Hz for indoor and outdoor use. Filters and manometer are included.