Calipers
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Calipers or callipers are an instrument used to measure the linear dimensions of an object or hole; namely, the length, width, thickness, diameter or depth of an object or hole. The word caliper comes
A vernier caliper clamping on an object
A bronze sliding pinch scale (collected by the Yangzhou Museum) excavated from the tombs belonging to the Eastern Han dynasty (Gansenshan tombs in Hanjiang District, Yangzhou City)
Two inside calipers
Three outside calipers
Caliber
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In guns, particularly firearms, but not artillery, where a different definition may apply, caliber is the specified nominal internal diameter of the gun barrel bore – regardless of how or where the bo
Calipers
…of an object or hole; namely, the length, width, thickness, diameter or depth of an object or hole. The word caliper comes from a corrupt form of caliber. Many types of calipers permit reading out a measurement on a ruled scale, a dial, or an electronic digital display. A common association is to calipers…
7.92 mm caliber rifle barrel (Mauser m/96)
Rifle cartridges: from left: 50 BMG • 300 Win Mag • 308 Winchester • 7.62 × 39 mm • 5.56 × 45 mm NATO • 22 LR
A 45 ACP hollowpoint (Federal HST) with two 22 LR cartridges for comparison