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The ruler is pen-styled unlike an usual ruler or a tapeline. It can measure a curved line or surface that are difficult to be measured by a regular ruler. If you draw or doodle on the paper with the pen-styled ruler, the distance that pen traveled will be measured by a circled sensor attached at the bottom of the pen and this will be shown on the head of the pen. It can be used variously in your life when you tailor clothings or measure a length of an object.
Chungcheongnam-do, North Korea
Gyeonggi-do, South Korea