Inch is the smallest unit of length in the US customary system, the inch. Originally, inch was derived from the old English unit “ince”.

United States, Canada, and the United Kingdom use inch as the customary unit of length. Inch is most common used to express the size of display screens and other electronic devices.

Centiinch equals 0.01 inch. It is used to measure dimensions smaller than 1 inch.

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