The guys at Yankodesign have posted a concept gadget called the E-Ink ruler. The e-ink ruler is a Tape Measure that uses e-ink on the tape rather than fixed drawn on measurements. By using e-ink the measuring system can be easily switched between metric or imperial to show a number more familiar with you.
The e-ink tape would be designed flexible to allow it to roll up like a regular tape measure and thanks to e-ink technology, the battery could last a month or more.
We don’t know if anything like this would actually be practical enough to create, but I quite like the odd concept here and there to see what minds are designing around the world.
More details at Yanko, via: UberGizmo