Tikk-Tekk Rainbow
Tikk-Tekk Rainbow is a low-cost universal measuring tool between finger tips. Apart from printed digits and embossed Braille, the “Tikk, tikk… tekk!” knocking feedback is handy for everybody, and is also pleasant to play with. At the precision of 1cm, the string extends 100cm, enough for daily use.
http://guopengliang.com/portfolio/tikk-tekk-rainbow/
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