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[–] 45 points 3 years ago (6 children)

Of course you could just write on a sticker with a pen, but where's the fun in that!

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  • [–] [S] 6 points 3 years ago (3 children)
  • [–] 2 points 3 years ago (2 children)

    And once you've got the QR codes on, you setup a pi with a camera than can read them and give you the results, maybe with a red/yellow/green LED for age :-)

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