An alcohol tester (breathalyzer) is a portable electronic device used to measure the concentration of alcohol in a person’s breath and estimate their blood alcohol concentration (BAC). It is commonly used by law enforcement agencies, workplaces, and individuals to assess alcohol impairment. The device typically consists of a mouthpiece, a breath sensor (fuel cell or semiconductor), a microprocessor, a digital display, and a rechargeable or replaceable battery. It is designed to provide fast, accurate, and reliable alcohol measurements while being compact and easy to operate.

Operation:
To operate an alcohol tester, the device is switched on and allowed to complete its self-check or warm-up cycle. A clean mouthpiece is attached, and the user blows steadily into it for the required duration. The breath sample is analyzed by the sensor, and the alcohol concentration is displayed on the digital screen within a few seconds. After testing, the mouthpiece is removed or replaced, and the device is switched off and stored in a clean, dry place. Regular calibration and proper maintenance are essential to ensure accurate and consistent readings.