the invention provides an electrofluidic pin transducer which maintains a stable null setting for a control pin . in the control mode of operation , the pin is rotatable in a conventional manner about a first axis which is perpendicular to the longitudinal axis of the pin . in the null setting mode , a cam arrangement is employed to effect rotational movement of the pin about a second axis which is perpendicular to the first axis and parallel to the longitudinal axis of the pin . this arrangement effectively makes control independent on null setting .