Pliers which have a first gripper jaw (1) comprising a gripper jaw body (3) and a gripper jaw element (4) that can be moved relative to the gripper jaw body (3), a second gripper jaw (2) comprising a gripper jaw body (3′) and a gripper jaw element (4′) and a sensor (5). The sensor (5) is disposed on the gripper jaw body (3) such that said sensor can be triggered by the gripper jaw element (4). A contour (6) is formed on the gripper jaw element (4′) in a region oriented towards the gripping region of the pliers. A contour (6′) is likewise formed on the gripper jaw element (4) in a region oriented towards the gripping region of the pliers. The contours (6, 6′) are configured such that, in the closed state of the pliers, the contours (6, 6′) are substantially in mesh in a mutually complementary manner.