An axial movement linear gauge includes a support and protection structure (21) that defines a longitudinal axis, a spindle (11) movable along the longitudinal axis with an external surface on which a longitudinal groove (12) is achieved, a feeler (14), a position transducer (32), a thrust device (36) for thrusting the spindle with respect to the support and protection structure, guide devices (22) for guiding movements of the spindle along the longitudinal axis with respect to the support and protection structure, and an antirotation system for preventing rotations of the spindle about the longitudinal axis that includes antirotation elements (50,51), stationary with respect to the support and protection structure, cooperating with the longitudinal groove.
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