When inspecting a disposable mask, it can be divided into four steps. It is very important to learn to properly check the quality of the mask. First of all, you should observe the mask to see if it is color, whether it is flat, check the transparency; then try the feel, mainly to feel the material, if it is too hard or rough, it is very uncomfortable to wear.
When you buy a mask, you can smell it to see if there is any smell. If there is any smell, it is better to choose such a mask as much as possible.
The next step is to look at the effect of wearing. We buy masks for wearing. If you have uncomfortable feelings or have different feelings, such as ear or itching, the quality of these masks is unqualified. of.