Ruler

A ruler is a flat, straight-edged tool used to measure lengths or draw straight lines. Commonly made from plastic, wood, or metal, rulers are essential in education, engineering, architecture, and various crafts. They come in a variety of lengths, with markings in inches, centimeters, or both, making them versatile for metric and imperial measurement needs. Whether for school, office, or industrial use, a ruler is a practical and reliable measuring instrument.