Application: Mask Visual Field Tester to determine whether field of vision under the mask meets the standard requirement or not. Standards: GB 2890-2009 Respiratory protection Self-priming filter gas mask 6.8 Field of visionĀ GB 2626-2019 Respiratory protective products ...
Face Masks bacterial filtration efficiency BFE tester is to determine the bacterial filtration efficiency (BFE) of medical face mask materials by employing a ratio of the upstream bacterial challenge to downstream residual concentration of the tested medical face mask ...