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The Digital Portable Breathalyzer from BrickHouse Security detects traces of metabolized alcohol on a person's breath, helping you determine if someone has been drinking or not, and to what degree. The Digital Breathalyzer delivers fast, accurate results on an easy-to-read display. Press a single button and blow into the breath sensor to get a reading between 0.0 and 0.19% BAC (Blood Alcohol Content), with an accuracy rating of +/- 0.01% BAC.