Digital Air Permeability Testing Machine, Digital Air Permeability Testing Machine is used to examine the decreasing efficiency of filters over time in order to predict a filters working life and many more. It is a method that is defined as the rate of airflow passing perpendicularly through a known area under a prescribed air pressure differential between the two surfaces of a material. Digital Air Permeability Testing Machine is best suitable for measuring the permeability of fabrics to air that can be applicable to most types of fabrics including industrial fabrics for technical uses, nonwovens, and made-up textile articles that are permeable to air.