A passive device includes a non-conductive housing including an upper and lower housing section, a conductive section housed in the upper housing section, and a pressure assembly housed in the lower housing section. The pressure assembly includes a compressible conductor, a mounting structure coupled to the compressible conductor and the upper housing section, a conductive contact coupled to the compressible conductor and the conductive section, and a firm spherical conductor. The firm spherical conductor includes an upper contact point for contact with the compressible conductor and a lower contact point for contact with the touchscreen. When z-direction pressure is applied on the firm spherical conductor, the compressive conductor compresses against the upper contact point. Compression of the compressive conductor increases surface area between the firm spherical conductor and the compressive conductor. The increase in surface area increases the capacitance of the passive device.