<img alt="headphone-ruler.png" src="http://lifehacker.com/assets/resources/2007/08/headphone-ruler.png" width="305" height="266" class="postimg right" /r Collaborative DIY site Instructables suggests marking off inches on your headphone cord so you've got a quick measuring tape on hand wherever you go. The guide uses iPod headphones, which measure about 79cm, marking off every centimetre in black and every 10cm in red.
Use Your Headphones as a Tape Measure
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