Abstract: A system for measurement of a signal generated through interaction between a device and an electrically active surface member wherein a flexible conductive tip element supported by the device's body, when in contact with or proximity of the electrically active surface member, gives rise to a signal which is variable as a function of the contact area between the tip element and the surface member or of the proximity of the tip element to the surface member, and wherein there is circuitry to afford a grounding path for the flexible conductive tip element and to measure the signal; and further a method for measuring a signal resulting from such interaction.