Argox PA-20 Portable Data Collectors User Manual - Manual (Page 34)

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When reading a small bar code, decrease the distance between the terminal and the bar code.
For larger bar codes, position the terminal so that the bar code fits into the LED light beam.
When reading a very high density bar code, decrease the distance between the terminal and the
bar code. For a low density bar code, increase the distance between the terminal and the bar
code.
5.2 Barcode reading problems
When the barcode can not be read, try the following:
 Change the angle between the bar code and the terminal.
 Change the distance between the bar code and the terminal.
 If the bar code is larger than the LED light beam, try moving the terminal a bit further
away from the bar cod