The quality, ability, or standard of a person or thing; it can also refer to the internal diameter of a gun barrel.

Examples

• She is a teacher of exceptional caliber.
• The company is looking for employees of a high caliber.
• The caliber of the competition was extremely high. 

An instrument used for measuring the distance between two opposite sides of an object, especially its thickness or diameter.

Examples

• The mechanic used calipers to measure the thickness of the metal.
• The engineer checked the diameter with a pair of calipers.
• Calipers are useful for making precise measurements.