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Mask time guard / Medicine

Mask time guard

When we wear disposable masks, we often don't know when to change masks. Caused the mask is not sanitary and waste.
Masks security guards is in ordinary mask based on, in the middle of adding pH test paper, through exhaled gases and pH test paper contact, will produce color from white to blue change, reminder of the need to replace the masks, keep health.

University

Jiangxi University of Finance and Economics

Jiangxi University of Finance and Economics
Nanchang, China

Shiyu Wang,
Jiangxi University of Finance and Economics

Longgu Lam,
Jiangxi University of Finance and Economics