A digitized pickoff system is provided for sensing displacement of complementary elements of a dual element pickoff assembly in an inertial sensor for use in an inertial navigation system comprising a relaxation oscillator adapted to sequentially select each of the pickoff elements with the reactance of the selected element determining the oscillating frequency thereof, a data converter adapted to measure the oscillating period thereof, and logic means having an output of a digital number which is proportional to the difference of oscillator periods of the two elements of the dual element pickoff assembly and which is a digital representation of the pickoff displacement.