<p>The present invention discloses a two-way marker including a main body where a through-hole for wire penetration is formed so that characters and patterns are printed on upper and lower surfaces of the wire; an upper printing device that is positioned above the wire to print characters on the upper surface of the wire; a lower printing device that is positioned below the wire to print patterns on the lower surface of the wire; an upper cylinder that is positioned above the upper printing device and presses the upper printing device to the upper surface of the wire; and a lower cylinder that is positioned below the lower printing device and presses the lower printing device to the lower surface of the wire.</p>
