Alcohol tester solution
Function introduction
1. Power on: Press and hold the button for 2 seconds to power on. The buzzer will emit a "beep" sound, and the LCD will display fully for 1 second.
2. Preheating: The buzzer will sound "beep" to indicate the start of a 10-second preheating process. At the same time, the following will be displayed: ① preheating symbol, ② battery level, ③ sensor lifespan indicator, ④ 10-second countdown timer, and ⑤ an arc.
3. Measurement: The buzzer beeps once, initiating a 10-second measurement. Simultaneously, it displays ① the blowing symbol, ② the battery level, ③ the sensor lifespan indicator, ④ a 10-second countdown display, and ⑤ an arc.
4. Results: The buzzer beeps once, and the 10-second result display begins, simultaneously showing ① result indicator, ② battery level, ③ sensor lifespan indicator, ④ measured value and unit, ⑤ arc, and ⑥ warning level indicator. When the result exceeds the range, the buzzer beeps continuously in a triple "beep-beep-beep" pattern for alarm; in this state, long-pressing the button for 2 seconds enters the history display.
5. Historical records: The buzzer beeps once, displaying the record number for 1 second (1~50), then showing the historical records and units for 9 seconds, accompanied by ① result indicator ② battery level ③ sensor lifespan indicator ④ warning level indicator; in this state, short press of the button increments the record number cyclically and restarts the timing display; no arcs around the numerical values are displayed in this state.
6. Shutdown: The buzzer beeps once, the sensor lifespan indicator is displayed for 1 second, and then the screen turns off and the device shuts down.
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