caliper

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caliper(s)

(kăl′ĭ-pĕr) [Fr. calibre, diameter of bore of gun]
A hinged instrument for measuring thickness or diameter.
References in periodicals archive ?
Philippa was occasionally allowed to take off her callipers - "I really loved that sense of freedom," she says.
At nine, Philippa was told she would have to wear callipers for another six years.