Device for signalling the level reached by the coffee infusion in a moka coffeepot provided with a vertical central conduit, the top area of which has at least one opening for the delivery of the coffee infusion, comprising: - two electrical connectors (12.1; 12.2, 12.2') having respective end electrodes (12.3; 12.4, 12.4'), of which at least one (12.3) extends inside the coffeepot; - a source of electrical energy, the poles (P+, P-) of which are electrically connected, respectively, to the ends of said electrical connectors (12.1; 12.2, 12.2') opposite said electrodes (12.3; 12.4, 12.4'); - electrical alert means, powered by said source in the event of the passage of electrical current between said electrodes (12.3; 12.4, 12.4'); - a body made of electrically insulating material, supporting said electrical connectors (12.1; 12.2, 12.2') with respective end electrodes (12.3; 12.4, 12.4'), - a slot provided in said body with which a top edge of the side wall of said coffeepot is engaged; - an outer part (11.1) of said body, including said electric alert means and said source of electrical energy, and providing a first element, external to the coffeepot, for anchoring said body at said slot, characterized in that said body comprises: - an inner part (11.2) comprising a rigid arm, from which protrude a lower overhang and a splash screen that protects at least one (12.3) of said electrodes (12.3; 12.4, 12.4') from splashes of liquid, and wherein said overhang provides a second element, inside the coffeepot, for anchoring said body at said slot and in cooperation with said first outer element (11.1) of said body, and in that said rigid arm supports said splash screen at least in the area of said top area of said vertical central conduit of said coffeepot and said splash screen at least laterally wraps around said top area of said central conduit of said coffeepot in the area of said at least one opening. - two electrical connectors (12.1; 12.2, 12.2') having respective end electrodes (12.3; 12.4, 12.4'), of which at least one (12.3) extends inside the coffeepot; - a source of electrical energy, the poles (P+, P-) of which are electrically connected, respectively, to the ends of said electrical connectors (12.1; 12.2, 12.2') opposite said electrodes (12.3; 12.4, 12.4'); - electrical alert means, powered by said source in the event of the passage of electrical current between said electrodes (12.3; 12.4, 12.4'); - a body made of electrically insulating material, supporting said electrical connectors (12.1; 12.2, 12.2') with respective end electrodes (12.3; 12.4, 12.4'), - a slot provided in said body with which a top edge of the side wall of said coffeepot is engaged; - an outer part (11.1) of said body, including said electric alert means and said source of electrical energy, and providing a first element, external to the coffeepot, for anchoring said body at said slot, - an inner part (11.2) comprising a rigid arm, from which protrude a lower overhang and a splash screen that protects at least one (12.3) of said electrodes (12.3; 12.4, 12.4') from splashes of liquid, and wherein said overhang provides a second element, inside the coffeepot, for anchoring said body at said slot and in cooperation with said first outer element (11.1) of said body,