The pressure-metering system of the improved depth gauge mechanism is housed in a pressure converter on the left-hand side of the case. Through the pressure converter, water pressure acts on a spring membrane and pushes a shaft towards the interior of the case. This movement is transmitted through a system of levers and moves the gauge’s two indicators at the centre of the watch. While the blue current depth indicator moves to show current dive depth, the red maximum depth indicator remains at the maximum depth attained in the course of the dive, prevented by a pawl from returning to its original position. The maximum depth indicator can be reset to zero by pressing a push-button.