This is a convenient online ruler that could be calibrated to actual size, measurements in cm, mm and inch, the upper half is the millimeter ruler and centimeter .
Here are some rulers you can print out.. Centimeter/Inch rulers (narrow, parallel ). Such as paper — US 8.5 x 11.0 in, 216 x 279.4 mm; A4 210 x 297 mm.
Can't find a ruler around you? Need to measure something urgently? I have listed 7 free online rulers in cm, mm, and inches. Some of them are pretty accurate!
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A metric ruler is the standard instrument for measurement in the scientific laboratory. On a metric ruler, each individual line represents a millimeter (mm).