Abstract: A support disk of insulating material is formed with at least two apertures therethrough located side-by-side, and has a metallization layer applied thereto shaped to form a common stator electrode. At least two disk rotors are placed against the common support disk, each having an electrically conducting shaft passing through the respective aperture of the stator, and each disk rotor having a rotor electrode thereon. The disk rotors are, respectively, of different sizes, of different dielectric constant, or of different thickness, or of different dielectric-temperature varying material, and each one of the shafts is carried out to a separate lead to provide a separate terminal for the rotors, individually, against the common stator electrode, to provide for coarse and fine adjustment, by varying, respectively, the rotor having the higher capacitor unit, or to provide for temperature compensation by simultaneously varying the position of two rotors of different dielectric-temperature coefficient.