Flow meter for gas (100; 200; 300), preferably comburent and/or fuel gas, more preferably natural fuel gas, in the form of a container constituted, in use, by: - a metal upper half-case (1; 1'; 1") without holes in its side walls for the passage of electrical cables and provided with a perimeter edge in the form of a first horizontal planar flange, - a metal lower half-case without holes in its side walls for the passage of electrical cables and provided with a perimeter edge in the form of a second horizontal planar flange, suitable for abutting, in use, against said first horizontal flange,, - an indicator placed on said upper half-case (1;1';1") or lower half-case for the display of the measurement of said flow - at least one flat electrical cable, insulated along its entire length, coming from and connected electrically to a unit of measurement and shutoff (when present) made up of one or more electrical/electronic modules of measurement and shutoff (when present) of flow of said gas which are placed inside said meter (100;200;300), the portion of said electrical cable placed inside said container being in direct contact with said gas, - connection means in the form of a perimeter annular band positioned at the horizontal abutting plane of said first horizontal flange against said second horizontal flange, said band having at least one annular portion reflanged on at least one of the two horizontal flanges (5,9) so as to seam said upper half-case (1;1';1") to said lower half- case characterised in that - said insulated and flat electrical cable exits from said container of said meter (100;200), without any cable fitting, through an opening in the form of slot or indentation, formed in a portion of said flange and positioned at the horizontal abutting plane of said first flange against said second flange, - said electrical cable being substantially in contact with each of said first flange and second flange so as to be pressed and restrained in horizontal position by said horizontal flanges (5,9) so as to avoid the movement of said electrical cable with respect to said slot or said indentation, - sealing means are further provided, suitable for sealing said cable, said upper half-case (1; 1'; 1") and/or said lower half-case of said meter so as to create tightness to said gas. - a metal upper half-case (1; 1'; 1") without holes in its side walls for the passage of electrical cables and provided with a perimeter edge in the form of a first horizontal planar flange, - a metal lower half-case without holes in its side walls for the passage of electrical cables and provided with a perimeter edge in the form of a second horizontal planar flange, suitable for abutting, in use, against said first horizontal flange,, - an indicator placed on said upper half-case (1;1';1") or lower half-case for the display of the measurement of said flow - at least one flat electrical cable, insulated along its entire length, coming from and connected electrically to a unit of measurement and shutoff (when present) made up of one or more electrical/electronic modules of measurement and shutoff (when present) of flow of said gas which are placed inside said meter (100;200;300), the portion of said electrical cable placed inside said container being in direct contact with said gas, - connection means in the form of a perimeter annular band positioned at the horizontal abutting plane of said first horizontal flange against said second horizontal flange, said band having at least one annular portion reflanged on at least one of the two horizontal flanges (5,9) so as to seam said upper half-case (1;1';1") to said lower half- case - said insulated and flat electrical cable exits from said container of said meter (100;200), without any cable fitting, through an opening in the form of slot or indentation, formed in a portion of said flange and positioned at the horizontal abutting plane of said first flange against said second flange, - said electrical cable being substantially in contact with each of said first flange and second flange so as to be pressed and restrained in horizontal position by said horizontal flanges (5,9) so as to avoid the movement of said electrical cable with respect to said slot or said indentation, - sealing means are further provided, suitable for sealing said cable, said upper half-case (1; 1'; 1") and/or said lower half-case of said meter so as to create tightness to said gas.