Fast and accurate digital alcohol tester with BAC detection range 0.00%0.19% (0.01.9 g/l) and 0.01% BAC resolution, providing reliable results in 310 seconds for quick safety checks before driving or operating machinery. Professional testing technology: advanced semiconductor sensor delivers consistent readings, with a clear LCD display showing results in multiple units (g/l, mg/ml, or BAC) to help you assess your alcohol level accurately. Contactless operation for safety: simply blow for 35 seconds near the detector port without direct contact, reducing crosscontamination risk while receiving clear visual alerts. Caution is shown at 0.02%0.05% BAC and Danger with sound/light alarm for readings ≥0.05% BAC. Portable design with long battery life: compact 185*43*25 mm size fits easily in pockets or bags, powered by a rechargeable 500mAh lithium battery with USB charging capability and auto shutoff after 10 seconds of inactivity to maximize usage between charges. Practical use scenarios: before driving or riding, before operating machinery or safetysensitive equipment, and after social events to decide whether to drive or seek alternative transportation.