From: Joel M. Sciamma (joel_at_inventors-emporium.co.uk)
Date: Thu Dec 25 2003 - 01:43:52 PST
Chris,
> I cant scan barcodes that are behind plastic (i.e.
> cd cases etc..)
The wand has a very small depth of field i.e. it focuses the spot very close
to the tip and is designed to be in contact with the barcode itself.
Shiny surfaces can also be a problem as the difference in reflectivity
between light and dark areas is reduced enough that the wand can't
distinguish them. Changing the angle the wand makes with the surface can
help. Barcodes that are not black and white can reduce contrast too.
Barcodes have been getting smaller over the years and some may be too tight
for the wand to recognise them properly but the tiny labels on my equipment
are mostly still read OK.
To get the best results, start well before the barcode and sweep across it
at an even and brisk rate - you can also try scanning in the reverse
direction.
Ideally the scanner is a complement to labels you print yourself and in this
mode it can be a great time saver.
Joel.
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