Syringe comprising a barrel , a plunger moveably arranged within said barrel and a plunger rod for driving said plunger , and an engagement member arranged at the barrel to engage with a grooved surface on the plunger rod such that feedback is given to a user as the plunger rod is moved relative to the barrel for driving said plunger ; wherein the engagement member comprises a main part having a circular or semi-circular shape, or being generally plate shaped, and a protruding element protruding from said main part for engaging the grooved surface of the plunger rod , wherein the extension of the protruding element in a direction parallel to said longitudinal direction of the plunger rod, is larger than the thickness of the engagement member perpendicularly to said longitudinal direction, and wherein an end portion of the protruding element is provided with a tapering in said longitudinal direction, and characterized in that, said barrel and said engagement member are arranged relative to each other such that the engagement member , due to engagement with the grooved surface of the plunger rod , is arranged to move solely in a direction generally perpendicular to a longitudinal direction of said plunger rod as the plunger rod moves relative to the barrel ; wherein the engagement member is configured to reciprocate between two given turning points irrespective of a direction of movement of the plunger rod , and the protruding element is configured to slide over the grooved surface as the plunger rod moves, and wherein the extension of the protruding element in a direction parallel to the longitudinal direction of the plunger rod is large enough to avoid that the protruding element is bent in a direction parallel to the longitudinal axis of the plunger rod . wherein the engagement member comprises a main part having a circular or semi-circular shape, or being generally plate shaped, and a protruding element protruding from said main part for engaging the grooved surface of the plunger rod , wherein the extension of the protruding element in a direction parallel to said longitudinal direction of the plunger rod, is larger than the thickness of the engagement member perpendicularly to said longitudinal direction, and wherein an end portion of the protruding element is provided with a tapering in said longitudinal direction, and characterized in that, said barrel and said engagement member are arranged relative to each other such that the engagement member , due to engagement with the grooved surface of the plunger rod , is arranged to move solely in a direction generally perpendicular to a longitudinal direction of said plunger rod as the plunger rod moves relative to the barrel ; wherein the engagement member is configured to reciprocate between two given turning points irrespective of a direction of movement of the plunger rod , and the protruding element is configured to slide over the grooved surface as the plunger rod moves, and wherein the extension of the protruding element in a direction parallel to the longitudinal direction of the plunger rod is large enough to avoid that the protruding element is bent in a direction parallel to the longitudinal axis of the plunger rod . <EOS>