I can think of a few legal and illegal occupations that would find 'Intelligent Counting' extremely useful. 'Intelligent Counting' is a currency-counting thumb ring from designer Yitu Wang that is also doubles as a counterfeit currency detector.
'Intelligent Counting' is designed to work with the technology already embedded in currency to help fight fraud. I'm all for fighting fraud and I could really see this device taking off in banks. Check it out here.
Anti-Counterfeit Thumb Rings
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'Intelligent Counting' Counts Cash and Finds Fakes
By: Michael Hines - Published: Feb 25, 2011 • References: yankodesign