Portable detection device for detecting objects that influence a magnetic field, said device comprising a magnetic field probe and an electronics unit which processes the measured values of the magnetic field probe and indicates said values at least visually and/or acoustically, said device also comprising a support/guide tube having a front end, to which the magnetic field probe is or can be pivotably fastened, having a rear end, on which a battery compartment is arranged, having a handle for guiding the support/guide tube, and having a mount for the electronics unit, the support/guide tube being formed in multiple parts, as a telescopic support tube, and comprising at least one front telescopic tube and a rear telescopic tube which can be pushed into one another and can be secured to one another by means of a tube clamping device, characterised in that • the magnetic field probe is rod-shaped, and • the support/guide tube supports a cordless, removable/attachable electronics unit, • the electronics unit comprises a screen having display means, which screen is articulated to a modular housing of the electronics unit and can be pivoted from a non-use position, in which the display side of the screen rests flat against the modular housing, into a use position, in which the display side of the screen is visible and extends, tilted backwards, away from the modular housing, and vice versa, • the modular housing of the electronics unit comprising a front side that has a control panel comprising control elements, and a free space for receiving the hinged screen in the non-use position, the free space extending directly adjacently to the control panel and having a size that at least corresponds to the screen, such that the control elements of the control panel are not covered, even when the screen is in contact with the free space, • the modular housing of the electronics unit comprising a rear side on which the electrical connections are grouped together to form a plug connector, and • the modular housing of the electronics unit comprising side flanks on which fastening means for the mount are arranged, • in that the mount of the support/guide tube comprises mounting means that are associated with the fastening means of the electronics unit, and an electrical mating plug connector that is associated with the electrical plug connector of the electronics unit, • and in that, when the electronics unit is inserted into the mount, said unit can be automatically mechanically and electrically coupled to the mount, • the plug connector of the electronics unit being detachably coupled to the mating plug connector of the mount, and • the fastening means of the electronics unit being detachably coupled to the mounting means of the mount. • the magnetic field probe is rod-shaped, and • the support/guide tube supports a cordless, removable/attachable electronics unit, • the electronics unit comprises a screen having display means, which screen is articulated to a modular housing of the electronics unit and can be pivoted from a non-use position, in which the display side of the screen rests flat against the modular housing, into a use position, in which the display side of the screen is visible and extends, tilted backwards, away from the modular housing, and vice versa, • the modular housing of the electronics unit comprising a front side that has a control panel comprising control elements, and a free space for receiving the hinged screen in the non-use position, the free space extending directly adjacently to the control panel and having a size that at least corresponds to the screen, such that the control elements of the control panel are not covered, even when the screen is in contact with the free space, • the modular housing of the electronics unit comprising a rear side on which the electrical connections are grouped together to form a plug connector, and • the modular housing of the electronics unit comprising side flanks on which fastening means for the mount are arranged, • in that the mount of the support/guide tube comprises mounting means that are associated with the fastening means of the electronics unit, and an electrical mating plug connector that is associated with the electrical plug connector of the electronics unit, • and in that, when the electronics unit is inserted into the mount, said unit can be automatically mechanically and electrically coupled to the mount, • the plug connector of the electronics unit being detachably coupled to the mating plug connector of the mount, and • the fastening means of the electronics unit being detachably coupled to the mounting means of the mount.