Automatic zero calibration with ambient air on every start of the system, optical and acoustical signal after finishing of calibration.
开启系统时，仪器会自动进行零校准。校准完毕后会出现光学和声学信号。
Automatic zero calibration with ambient air on every start of the system, optical and acoustical signal after finishing of calibration.
开启系统时，仪器会自动进行零校准。校准完毕后会出现光学和声学信号。
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