... permeability tester: Patend machine, Fully automatic, easy to use, just press down,the result would give out in 10 seconds. air permeability ... instrumentModel: YG461HIt is used to test the air permeability of various woven fabrics, ... permeation testers can quickly, concisely, accurately test the air permeability of various plane materials (fabrics, non-woven fabrics, ...