Use method of alcohol tester.
1. Press the button for 1 second to turn on, and the backlight and display screen will light up at the same time, displaying all the contents and "dropping" a prompt to turn on.

2. The display screen displays "Warm up" and the 10-second countdown. After the countdown ends, a "drop" will prompt you to enter the next stage at the same time.

3. The display screen displays "Blow" and 10 seconds countdown, blowing 3-5 seconds to the blowing place, after the countdown ends, "drop", prompting to enter the result display, the detection results are displayed in% BAC and g/l units.

4. When the detection result is less than 0.02%BAC, the green indicator light is always on.

5. When the detection result is greater than or equal to 0.02%ABC and less than 0.05%BAC, the yellow indicator lamp is always on, the display screen "Caution" icon is flashing, and there is a slow beep.

6. When the detection result is greater than or equal to 0.05%BAC, the red indicator light is always on, and the "hanger" icon on the display screen flashes with a rapid beep. The test results are displayed in 10 seconds.