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Calipers designed to measure the distance between two points during surgical procedures. These instruments are typically handheld, metallic, compasslike instruments with two adjustable, centrally hinged legs and sharp, rigid, either straight, angled or curved tips; the proximal end (i.e., the handle) usually includes a calibrated scale and a screw to adjust the separation of the legs (i.e., Castroviejo calipers). Other surgical calipers include instruments with an L-shaped frame with a linear scale along its longer arm and a second L-shaped sliding arm (i.e., Jameson calipers). Dedicated calipers are available for measuring eye and bone structures during ophthalmic and orthopedic surgery procedures.
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