Which instrument measures length in centimeters or inches?

• A. Ruler
• B. Graduated Cylinder
• C. Beaker
• D. Microscope

Answer: (A)

Measuring length in centimeters or inches is done with a ruler. A ruler is a straight edge marked with uniform divisions that show how long an object is. Many rulers have metric units (centimeters and millimeters) on one side and imperial units (inches) on the other, making it easy to measure in either system. The other tools are used for different purposes: a graduated cylinder and a beaker measure the volume of liquids, not the length of objects, and a microscope is used to magnify tiny specimens. So the ruler is the tool designed for length measurements in those units.