ParametricResearch & Control offers its most advanced Breathability Tester is basedon the principle of differential pressure. It is used to determine the facemasks resistance to airflow. In breathability test, a controlled flow of airis given through the mask, and the pressure is measured before and after thetest.   

Thedifference in pressure is divided by the surface in cmH2O of the sample. Alower breathing resistance indicates a better comfort level of the user and thehigher level of breathing indicates a less comfort level of the user.