The tool has a mobile nut (8) forming an actuator and for displacing a pivotable cutting blade (2). A trigger (6) and the mobile nut are respectively movable along linear or angular movements and respectively two oriented magnetization magnets (13, 15) displaced in front of two magneto-resistive sensors (14, 16). An electronic board having a microprocessor analyzes information emitted by the sensors according to inclination of magnetic field lines respectively associated to the sensors to control operation of the actuator so as to position the blade according to the position of the trigger.
