It is also tricky to capture the data in the field and stick the bar-code labels on the produce as it is picked and packed.

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If you have already created code for laying out labels according to the bottom or center point, your text will move around a little and you will need to adjust your constraints.

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In addition, they depend on an array of specialty devices, such as audio book-readers, color readers, navigation tools, raised Braille labels, special bar-code scanners, and large-buttoned, voice-enabled MP3 players which are prohibitively expensive.

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When users scratch off the labels, they see a numerical code.

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