A device for use in sensing a force and/or acceleration, comprising: a proof mass ( m) anchored to a base and operable by a combination of forces generating a bistable configuration in which a first stable region and a second stable region, where a motion of said proof mass is stable, and an intermediate unstable region are present; the device being characterized in that: the device comprises an elastic suspension arranged for anchoring said proof mass to the base; and an electrostatic actuator (106; 260) arranged for actuating said proof mass according to a selected time profile, such that said elastic suspension and said actuator apply said combination of forces to said proof mass and generate said bistable configuration in which the first and second stable regions are present, and in which the intermediate unstable region, in which the proof mass moves in an unstable manner, is located between said first and second stable regions, thereby enabling determination of a deviation of a measured location of a boundary between one of the first and second stability regions and said intermediate unstable region with respect to a predetermined location of said boundary corresponding to a condition of no force and/or no acceleration, said deviation being indicative of the force and/or acceleration acting on the proof mass. a proof mass ( m) anchored to a base and operable by a combination of forces generating a bistable configuration in which a first stable region and a second stable region, where a motion of said proof mass is stable, and an intermediate unstable region are present; the device being characterized in that: the device comprises an elastic suspension arranged for anchoring said proof mass to the base; and an electrostatic actuator (106; 260) arranged for actuating said proof mass according to a selected time profile, such that said elastic suspension and said actuator apply said combination of forces to said proof mass and generate said bistable configuration in which the first and second stable regions are present, and in which the intermediate unstable region, in which the proof mass moves in an unstable manner, is located between said first and second stable regions, thereby enabling determination of a deviation of a measured location of a boundary between one of the first and second stability regions and said intermediate unstable region with respect to a predetermined location of said boundary corresponding to a condition of no force and/or no acceleration, said deviation being indicative of the force and/or acceleration acting on the proof mass. the device comprises an elastic suspension arranged for anchoring said proof mass to the base; and an electrostatic actuator (106; 260) arranged for actuating said proof mass according to a selected time profile, such that said elastic suspension and said actuator apply said combination of forces to said proof mass and generate said bistable configuration in which the first and second stable regions are present, and in which the intermediate unstable region, in which the proof mass moves in an unstable manner, is located between said first and second stable regions, thereby enabling determination of a deviation of a measured location of a boundary between one of the first and second stability regions and said intermediate unstable region with respect to a predetermined location of said boundary corresponding to a condition of no force and/or no acceleration, said deviation being indicative of the force and/or acceleration acting on the proof mass.