Meaning of CALIPERS in English
noun ·pl an instrument, usually resembling a pair of dividers or compasses with curved legs, for measuring the diameter or thickness of bodies, as of work shaped in a lathe or planer, timber, masts, shot, ·etc.; or the bore of firearms, tubes, ·etc.;
called also caliper compasses, or caliber compasses.
Webster English vocab. Английский словарь Webster. 2012