Question

3) Which is the unit of length used to measure the thickness of the scale?​

Answer 1

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millimeter (mm) – a metric unit commonly used to express the length of very small objects like keys, and thickness of small objects like notebook.

Answer 2

The very small lengths are expressed in still smaller units called 'millimeters' e.g the thickness of a coin or a thin wire. One mm (millimeter) is the smallest length which can be measured accurately by using a meter scale.