Medical Face Mask Air Exchange Pressure Difference Tester is a lab testing instrument for determination breathability of medica face masks, the test principle is, through measuring the differential pressure required to draw air through a measured surface area at a constant air flow rate, to test the air exchange pressure of the medical face mask material, which indicates the breathability of medical face masks, tester complies with EN 149, EN 14683, ASTM F2100, MIL-M-36954C,GB 19083, GB 2626, YY/T 0969-2013 medical face masks testing standards. Medical Face Mask Air Exchange Pressure Difference Tester meets the standard requirements, which is EN 149, EN 14683, ASTM F2100, MIL-M-36954C,GB 19083, GB 2626 "Medical surgical mask technical requirements" and YY 0969-2013 "Disposable medical masks", medical face mask air exchange pressure difference tester is measured by gas pressure difference on both sides ...