A ruler (some say it should be called a rule!) is marked along an edge with (nowadays) centimetres and millimetres. Place the zero mark on the ruler at the start of the object to be measured, and read off the measurement at the other end of the object.
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a ruler is used to measure it and cm, sometimes inches to
You can measure the length of an object or the distance between two objects.
Measure the length, measure the width, measure the height, and multiply them all together. LxWxH = volume
measure with a ruler the length, width and height and multiply lxwxh
A ruler!