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Do you want to learn how to use the rulers?
There are many rulers in the world. And also we should learn how to use them.
Here we get some rulers which include some user cases. I think it can help your to lean how to use the rulers!
Now there are over ten rulers!!!!
More and more kinds of rulers（caliper）are coming soon!!
English, French, German, Japanese, Chinese
iPhone, iPad, iPod touch