Half a croissant, on a plate, with a sign in front of it saying '50c'
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Smartphone Coin Identifier app

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Whilst doing something else, a coin (or coins) fall out of your pocket. Instantaneously the Smart Coin Identifier (SCI) app leaps into action. By using the microphone it works out the value of the coin(s) and produces a verbal, or otherwise, report.

Going from the SCI report you will know instantly if it's really worth fishing around under the sofa with a stick/magnet/ruler with tape wrapped around it/etc right now, or not.

Would work best of hard flooring, but might also work on carpet.

not_morrison_rm, Feb 17 2017

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       I don't think the rare coin store owner is going to supply you with your database.
wjt, Feb 18 2017
  

       Out of every ten £1 coins, one in eight is counterfeit. Those new plastic £5 notes have probably changed this though.
Ian Tindale, Feb 18 2017
  

       Edit: Now works with BitCoins...
not_morrison_rm, Feb 18 2017
  
      
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