A method monitors an evolution of a physical quantity. The method includes measuring the evolution of the value of the physical quantity, and displaying in a first graphical zone a bar graph representing the evolution of the value received from the sensor until this value reaches a first threshold, the graphical zone has a first displaying scale. When the monitored value reaches the first threshold, the bar graph is displayed and represents the evolution of the value received from the sensor in a second graphical zone. The second graphical zone is a zoom of a part of the first graphical zone and has at least a second displaying scale. At least one magnified portion of the second graphical zone is further displayed, the magnified portion having at least a third displaying scale.