Abstract: A pulse hydraulic monitor comprises two barrels for alternately directing a pulsating jet of liquid onto a target, a valve means for dividing the flow of liquid, having an inlet for a hydraulic liquid, and two outlets for delivering the same into the barrels, and pulse-forming means. The pulse-forming means includes a through hollow enclosure, a separating member, two limit stops of the separating member, means for retarding the motion of the separating member. The through hollow enclosure is in hydraulical relationship with the barrels and the separating member is movable between two end positions relative the barrels so as to take one of these two end positions for forming a pulse when the pressure of the hydraulic liquid flowing in the corresponding barrel assumes a predetermined value.