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: percent BAC and g or l . 4. When the test result is less than 0.02 percent BAC, the green indicator light is always on. 5. When the test result is greater than or equal to 0.02 percent ABC and less than 0.05 percent 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 percent 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