Sensor system (1) comprising a frame (306) supporting a force-sensing tip (310) arranged to generate a signal based upon a force applied by said force-sensing tip (310) to a material to be tested,characterised in that said system (1) further comprises:- an input drum (301) mounted in said frame (306) such that it can rotate about an input axis of rotation (A);- an output lever (309) supported by said frame (306) by means of an output revolute joint (308) defining an output axis of rotation (C);wherein said force-sensing tip (310) is mounted on said output lever (309) such that said force-sensing tip (310) is arranged to be brought into contact with a material to be tested;and wherein said sensor system (1) comprises a mechanical transmission (302, 303, 304, 305, 307; 301a, 312) arranged to kinematically link said input drum (301) to said output lever (309) such that a rotation of said input drum (301) about said input axis of rotation (A) causes said output lever (309) to pivot in an oscillatory manner about said output axis of rotation (C).