| 摘要 |
A composite alcohol testing pen includes a lower barrel (1), an upper barrel (2) and a gas detection device (3) The upper barrel (2) has a switch (21) and a light emitting diode (2) located at the outer surface, and a circuit board (4) and a battery (7) located inside. The circuit board (4) has an analyzing unit for analyzing alcohol concentration. The gas detection unit (3) receives breathing air from an users and detects the alcohol concentration contained therein.
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