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The essence of ruler is line with scale, any object of a straight edge with the scale could be used as a ruler. Ruler makers design concept remounts to the functional origin of the ruler, it is a transparent film printed the scale, Tear off one piece of the certain length according to the need along the notch line, paste it on the certain object through electrostatic effect, then a ruler comes into being. When people need a ruler but theres no one aside, Ruler maker could transform the things around into a ruler or make them have the function of measurement, which will bring great convenience.