[High Accuracy ] With professional airway design and equipped with a high-quality fuel cell sensor, the portable breath alcohol tester provides you accurate results with the detection range of 0.000% -0.19% BAC (0.0-1.9g/l), accuracy is + / - -0.01% BAC(0.1 g / l), which helps you make right decision while drinking.[5 Mouthpieces] The alcohol tester comes with 5 replacement mouthpieces five nozzles, which can be cleaned and recycled. Not sharing the mouthpieces is more hygienic, making the test results more accurate.[One-button Easy Operation ] With just one button operation, you can easily turn on the alcohol tester and perform a 10-second warm-up, 5-second response, and a very fast response test. The LCD screen directly displays the accurate test results. It is very convenient and quick to use.[Clear LCD Screen] The breathalyzer is designed to give you professional accuracy for safe drive. The LCD graphic display will indicate how inebriated you are, whether it be dangerous (over 0.05% BAC), unsafe (approx. 0.02% BAC) or safe (under 0.02% BAC).Displays ""Caution"" when result is within 0.02% - 0.05%, Displays ""Danger"" when result equals to or higher than 0.05%.[Portable Size ] The alcohol tester is small and light, and can be easily put in your pocket. Making it easy to take with you anywhere you go.