Major strength of nsn-30 dust&airbone microbes sampler? 1.Digital-controlled:easy and precise flow adjustment(precise to 1 demical) 2. Easily calibrated:the only one dust collcter with high flow volume can be directly calibrated by soap film flowmeter 3. Specially designed:he unique vertically upward inlet guarantees all dust collected is needed in occupational health. 4. Globally innovated:with real time calculation software implanted, time to say bye-bye to manual computation 5. Widely applicated:available for the sampling of total dust&respirable dust&airborne microbes 6. Excellently performed:strong resistance to back pressure 5kpa;powerful battery5h constant run