⬇ Please select your screen size first for calibration

Length Units:

Select/Type Your Screen size:

You don’t have a ruler when you want to measure the length of an object? You can use the screen of your PC / Desktop or your smartphone screen using this online ruler application to make it easier for you to measure the length of an object with two choices, centimeter or inch. The maximum length of this ruler is 50 cm or 20 inches.

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