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In daily life, ruler is Indispensable, but longer ruler is not easy to carry, and the traditional folding ruler can just achieve a little length. But through 4 layers of nested and rotation，Folding Ruler can greatly expands the measurement range, folded only 15cm, the fully expanded it can reach to 50cm, rotating through the various parts of a ruler and locking the white axis of rotationsˊlock button, making Folding Ruler able to draw a variety of triangular shape and quadrilateral, it has powerful functions and very portable.