1. Find the production license number of the mask from the outer packaging of the mask, as shown in the figure below. Medical-grade masks must have a medical device manufacturer (license).
2. Baidu searches official website, the State Administration of Pharmaceutical Products, and then clicks on the website with the official icon. As shown in the figure below:
3. After entering the interface, click the medical device. As shown in the figure below:
4. Then click on the domestic equipment on the left (see if the mask is domestic or imported). As shown in the figure below: