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Problem: The mask cannot be used for a long time, and the mask needs to be replaced on time. Many users are aware of this common sense, but many may forget it, resulting in the accumulation of a lot of bacteria on the mask, the user's risk of bacterial infection will increase.
Solution: Test strips detect bacteria, the more bacteria, the more obvious the color change. The mask is blue on the outside, gradually changing color as the bacteria increase. The mask turns red on the outside to remind people the mask has been used for too long , it have a lot of bacteria and should be changed.This design can ensure the hygiene and health of users.
Central South University