Alcohol detector is an instrument used to detect whether the human body has ingested alcohol and the degree of alcohol intake.

It can be used as a detection tool for traffic police to check how much alcohol drivers drink during law enforcement, effectively reducing the occurrence of major traffic accidents; It can also be used in other occasions to detect the alcohol content in exhaled breath of the human body, avoiding significant casualties and property losses, such as in some high-risk areas where companies prohibit working under the influence of alcohol.