A system (100) for non-invasive measurement of tonicity, stress state, biomechanical or viscoelastic properties of soft biological tissues comprising a test end (1) movable along a Y axis and elastically supported on the inside a housing by a spring (134a, 134b), an actuator (3) arranged to apply a force at the test end (1), and a pulse signal generating circuit (7) to provide a pulse signal to the actuator (3) so that the biological tissues are subjected by the test end (1) to a mechanical impulse, and a sensor (2, 21) to detect the movement of the test end (1), in which the system comprises a signal generating circuit (6) to provide a control signal to the actuator (3) so that the biological tissues are subjected by the test end (1) to a load, the system includes a means (5) of signal adjustment provided by the circuit or (6) signal generation according to the weight component that acts through the test end (1) on the biological tissues so that the load to which the biological tissues are subjected has a predetermined value； wherein the system (100) comprises an accelerometer (2, 22) to provide a compensation signal (8.5) representing the Y axis component of the gravitational field； characterized in that the spring consists of leaf springs and that the signal adjustment means is an adding unit (5) to which the control signals from the signal generating circuit (6) and the signal are provided. compensation (8.5) representing the Y axis component of the gravitational field； wherein the adding unit (5) is arranged to add the control signal from the signal generation circuit (6) and to subtract the compensation signal (8.5) representing the Y-axis component in the gravitational field； and in which the pulse signal from the pulse generation circuit (7) is also provided to the adding unit (5), the pulse signal is added by the adding unit (5)； The output of the adding unit (5) is provided to the actuator, so that the mechanical impulse is transmitted and released quickly
