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n life,we often encounter this situation that
when we want to use a ruler really can not find
the time, or can not find a suitable ruler to
measure the product we want to measure. This
makes me think to do this product, it is easy to
carry, easy to use. It can make everything around
you become a convenience ruler, such as bank
cards, pens and the like, and can be used to
measure the size of some irregular objects.
South China Agricultural Universiti