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Easy-use Ruler can be easily picked up from a flat desktop due to its artful edge design. Moreover, the ruler has no clear pro or con side. You can use double sides of it instead of spending time on distinguishing the obverse side.
The ordinary ruler is not easy to remove from the flat desktop, but Easy-use ruler has also solved this problem, we can easily pick up the ruler from flat desktop.
When we use an ordinary ruler, we often overturn it again and again chronically in order to find the observe side.
This design adds some small changes to the rulers shape, making it stay both a positive side and a negative side at any moment.
Chen Jian; Liu Zhen; Zhou Hai-lun