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Why should I select my monitor size?

In order to display a ruler in its actual size, two details should be known: screen resolution and monitor size.
Your browser determines and exposes your screen resolutions, but there is no way to certainly know your monitor size without explicitly selecting it.
So, when you select your monitor size the site calculates and sets the pixel size of a ruler image and the result is accurate ruler in its actual size.
Return to the ruler