CEM DT-800A Breath Alcohol Analyser - Metravi InstrumentsAlcohol testers (breathalyzers) feature a sensor (fuel cell or semiconductor), a digital display, and a microprocessor for accurate BAC measurement. Common features include portability, digital LCD screens, different units of measurement (%BAC, g/L), long battery life, fast warm-up and recovery times, and often a non-contact testing method for health and convenience. More advanced models may include features like cameras, built-in printers, voice prompts, and automatic shutdown for energy saving