Buying a personal breathalyzer is primarily a choice between two sensor technologies: and Semiconductor . For users prioritizing reliability, experts and safety organizations consistently recommend fuel cell models because they offer higher precision and are not prone to false positives from substances like acetone or tobacco smoke. Core Technology Comparison Fuel Cell Sensor Semiconductor Sensor Accuracy High (±0.005% BAC) Moderate (±0.01% BAC) Specificity Reacts only to ethanol Prone to false positives (acetone, etc.) Lifespan Long (5+ years/thousands of tests) Shorter (1–2 years average) Calibration Every 12 months or 1,500 tests Every 6 months or 200 tests Price Point Premium ($100–$500+) Budget ($15–$100) Deep Features to Consider Wall Mount Breathalyzer(860) - Alibaba.com