Concept Pen Measures Its Own Lines, Makes Its Own Power

The Electronic Pen tells you just how much ink it has laid down, by distance. While it might be fun to know that your signature is exactly 13.37cm long, there are more practical uses, too.
For instance, you could use Jang Hyung-Jin’s concept pen to measure lines as you draw them, effectively turning any straight edge [...]

Source: http://www.wired.com/gadgetlab/2011/10/concept-pen-maasures-its-own-lines-makes-its-own-power/

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