YY0469-2011 "Masks", YY0969-2013 "Disposable Masks".
Instrument features:
1. Using a suction gas source as the power source for the instrument, not limited by the space of the testing site;
2. Equipped with precision differential pressure sensor, digital display of pressure difference on both sides of the sample;
3. Specially designed sample clamps ensure a secure grip on the sample.
