1. Enter a value in millimeters (mm) or inches (in) — the other field will be filled in automatically.

2. You can also enter a fraction, such as 3/8, in the "num" and "den" fields.

3. Use the checkboxes next to the rulers to show or hide subdivisions (e.g., 0.5 mm or 1/16″).

4. Click and drag the pointer (triangle) on the ruler to measure interactively.

5. Select your preferred language from the top menu (Portuguese, English, or Spanish).

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