Abstract: The invention relates to a sensor device for measuring attitude, acceleration or gravitational field and its gradient components. The device includes a spherical cavity (3) which contains a sensor substance in the form of a fluid or some other inertial material having fluidic properties. The cavity (3) is provided with measuring sensors or measuring electrodes (−x, +x; −y, +y; −z, +z) for three different coordinate axes x, y, z, all of said sensors responding to said common inertial mass which fills the cavity (3). Such assembled single compact measuring device can be used for determining any of the said quantities 3-dimensionally.