A breathalyzer is a handheld device used to estimate a person's blood alcohol concentration (BAC) by analyzing their breath sample. It measures the amount of alcohol present in the breath and translates it into the corresponding BAC level. Breathalyzers typically work based on a chemical reaction between the alcohol in the breath and an electrochemical fuel cell or a semiconductor sensor. This reaction produces an electrical current that is proportional to the alcohol concentration. The device then calculates and displays the BAC level, providing an indication of a person's intoxication level. Breathalyzers are widely used by law enforcement agencies to assess individuals' sobriety during traffic stops and are also popular among individuals concerned about responsible drinking or monitoring their own alcohol consumption.
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