High Precision Alcohol Tester The professional alcohol concentration tester AT-6000 adopts advanced semiconductor sensors to ensure accurate results in a short time. Hospitals, clinics and even law enforcement agencies trusted the results. One-button operation Turn on the tester, wait for 15 seconds to warm up, and then start the test, the result will be displayed on the LCD screen for 15 seconds. You can change the units (% BAC, BAC and mg/l) by pressing the keys AUDIO WARNINGIf the BAC result exceeds certain values, this breathalyzer will notify you with different sounds so that you can make a better judgment. This breathalyzer is battery powered. (3 AAA batteries required - not included in delivery, must be purchased separately) 31 Interchangeable Mouthpieces5 reusable mouthpieces for your family or friends to test more conveniently. For more accurate results, test 20 minutes after drinking. Please take a 3 minute break before the next test. Compact and PortableThis breathalyzer is smaller than an iPhone and can be kept in your pocket or purse anytime, anywhere. Ideal for social events such as weddings, parties, celebrations, etc., to help you decide whether it is suitable for self-driving.