Wearing a mask is an important line of defense to protect people from respiratory infections, it is particularly important to identify its authenticity.
Medical surgical masks, medical protective masks, etc., you can log on to the official website of the State Drug Administration, enter the medical device registration certificate number query, you can identify the authenticity. In addition, you can also check the quality of the mask. Qualified masks and shoddy masks will have significant differences under the same light source. In natural light, qualified masks are opaque when worn, while shoddy masks are vaguely visible on the facial skin.
In order to ensure the quality of the mask, it is recommended to buy from the regular channels, and retain the certificate. If you buy shoddy products, you can submit evidence to the official report.