Many things affirm to be credit-card sized, but nothing may be more immaculately expect than the Cardstick, a woman monarch that sticks onto your real credit card, and is thus atom-for-atom the expect same size as that card (if you disregard the fact that it adds a small height to a finish of the card).
Further, since the Cardstick is a ruler, you can portion other objects that affirm to be "credit-card sized" and authorize their credentials.
The Cardstick is a self-adhesive vinyl plaque that wraps around the corner of the credit card, gift 3 inches value of graduated measurement, with centimeters on the other side for people who caring how long things unequivocally are.
You're not paltry to credit cards, either. The plaque may be stranded on any existing prosaic object. A phone would be handy, as would a camera, paper cover or anything else you always bring with you. And if you're cheerful with knowing usually that it measures more than 3 inches, you could always hang it on your [Enough! -Ed].
The Cardstick is existing now, for $5.
Cardstick product page [Cardstick around Oh Gizmo! ]
See Also:
Carry On Flying: Gravity Ruler Weighs Checked Luggage
Sonar Ruler Turns iPhones in to Dolphins. Kinda
Retro-Electro Digital-Analog Ruler
New Rule Helps Visually Impaired to Measure Up
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