Abstract: A force sensor comprising an array of three conductive points respectively insulated from one another; a movable conductive element normally resting in contact with the points and thus producing an electrical interconnection therebetween and displaceable out of contact with at least one of the points in response to the application of a predetermined force to the sensor; means for connecting the three points to logic circuitry for sensing the interruption of the electrical interconnection and determining in response thereto whether an alarm condition exists; a housing containing the three point array and the movable conductive elements and having an outer configuration which includes a spherical portion; means fixedly mountable onto an article and defining a socket surface complementary to the spherical portion; and clamp means for selectably attaching the housing to the mounting means and permitting ready adjustment of the orientation of the spherical portion with respect to the complementary socket portion w