Identifying different denominations of dollar bills has long been a problem for the sight-impaired in the USA. A US $ 1 bill is the same size and shape as a $ 100 bill, making them hard to differentiate.
Many use techniques like folding different bills into different shapes, but this doesn't help when receiving change in a store. Looktel now has an app called Money Reader for the iPhone 4/3GS and fourth-generation iPod touch which will check bills and speak their values out
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