Portable Alcohol Tester Breathing Blow Alcohol Tester Drink Alcohol Tester How to use alcohol tester. Ships without battery by default 1. Press the button for 1 second to turn it on, the backlight and the display screen will light up at the same time, display all the content and a "beep" will prompt to turn it on. 2. The display shows "Warm up" and a 10-second countdown. After the countdown is over, there will be a "beep" sound, indicating that it will enter the next stage at the same time. 3. The display shows "Blow" and a 10-second countdown. Blow air to the blowing place for 3-5 seconds. After the countdown ends, there will be a "beep" sound, prompting to enter the result display. The test result is displayed in two units: %BAC and g/l . 4. When the test result is less than 0.02% BAC, the green indicator light is always on. 5. When the test result is greater than or equal to 0.02% ABC and less than 0.05% BAC, the yellow indicator light is always on, the "Caution" icon on the display screen flashes, and there is a slow beep sound. 6. When the test result is greater than or equal to 0.05% BAC, the red indicator light is always on and the "Danger" icon on the display screen flashes, and there is a rapid beep sound. The test result shows that the time is 10 seconds Packing: 1x Alcohol Tester