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Anthropometry calipers that externally measure the dimension of the cranium. They are also used to measure bony cranial structures or deformations of the head. These handheld instruments are frequently sturdy metal or hard plastic, and are compass-like in shape. They may include two adjustable, frequently curved, hinged legs or jaws. Some calipers include a central graduated frame, two sliding flat bars with ball ends for introduction in the ear canal, and an auxiliary graduated scale to facilitate fine adjustment and increase the accuracy of measurement (i.e., vernier calipers). Some of these calipers are intended to measure head deformation (i.e., plagiocephaly) in infants.
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