Inches

On most standard rulers, the side marked "inch" or "in" uses large, bold numbers to represent whole inches. The lines between these whole numbers represent fractions of an inch, which can be identified by their height: How to Read a Tape Measure - The Home Depot

An inch is a standard unit of length in the Imperial and U.S. Customary systems of measurement. It is most commonly used in the United States for everything from construction and DIY projects to measuring personal height. Reading a Ruler or Tape Measure inches