Metrologic Instruments MS6520 Series 用户手册

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Each scanner has a label on the back of the unit that lists the model number,
date of manufacture, serial number, CE and caution information.  The following
is an example of the label:

Smudges and dirt can interfere with the proper scanning of a bar code.
Therefore, the output window will need occasional cleaning.

1.

Spray glass cleaner onto lint free, non-abrasive cleaning cloth.

2.

Gently wipe the scanner window.