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How does the button model calculate?
- May 09, 2017 -

With a swim ruler, you can measure directly, if you don't have a swim ruler, you can put a button on the desktop. At the lower end of the button to put a ruler, left and right a ruler, perpendicular to the bottom of the button, the ruler can be directly read the data, rulers not enough, the rulers can also use other straight objects instead, perpendicular to the bottom of the ruler can.


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