Oxyacetylene-type work apparatus comprising: - a first container containing acetylene, - a first manometer to measure the pressure in the first container, said first manometer comprising a first dial and a first pressure indicator rotationally movable with respect to said first dial, - a first two-dimensional marking arranged on the first dial, said first pressure indicator being able to occupy several angular positions with respect to said first marking depending on the value of the pressure in the first container, - a second container containing oxygen, - a second manometer to measure the pressure in the second container, said second manometer comprising a second dial and a second pressure indicator rotationally movable with respect to said first dial, - a second two-dimensional marking arranged on the second dial, said second pressure indicator being able to occupy several angular positions with respect to said second marking, depending on the value of the pressure in the second container, - a device for taking images configured to take images of the first manometer and of the second manometer, - an electronic logic circuit configured to process said images of the first and second manometers (1, 2) in order to determine the respective angular positions of the first and second pressure indicators with respect to the first and second two-dimensional markings (5, 25) and to deduce, from said angular positions, the pressure values measured by the first and second manometers (2, 22) respectively, characterised in that: - the apparatus further comprises a sensor for the temperature of the first container of acetylene, the electronic logic circuit being configured to: - determine, based on a predetermined initial quantity of acetylene in the first container, on the value of the temperature of the first container measured by the sensor and on the value of the pressure measured by the first manometer, the residual quantity of acetylene in the first container, and - determine, based on a predetermined initial quantity of oxygen in the second container and on the value of the pressure measured by the second manometer, the residual quantity of oxygen in the second container. - a first container containing acetylene, - a first manometer to measure the pressure in the first container, said first manometer comprising a first dial and a first pressure indicator rotationally movable with respect to said first dial, - a first two-dimensional marking arranged on the first dial, said first pressure indicator being able to occupy several angular positions with respect to said first marking depending on the value of the pressure in the first container, - a second container containing oxygen, - a second manometer to measure the pressure in the second container, said second manometer comprising a second dial and a second pressure indicator rotationally movable with respect to said first dial, - a second two-dimensional marking arranged on the second dial, said second pressure indicator being able to occupy several angular positions with respect to said second marking, depending on the value of the pressure in the second container, - a device for taking images configured to take images of the first manometer and of the second manometer, - an electronic logic circuit configured to process said images of the first and second manometers (1, 2) in order to determine the respective angular positions of the first and second pressure indicators with respect to the first and second two-dimensional markings (5, 25) and to deduce, from said angular positions, the pressure values measured by the first and second manometers (2, 22) respectively, - the apparatus further comprises a sensor for the temperature of the first container of acetylene, - determine, based on a predetermined initial quantity of acetylene in the first container, on the value of the temperature of the first container measured by the sensor and on the value of the pressure measured by the first manometer, the residual quantity of acetylene in the first container, and - determine, based on a predetermined initial quantity of oxygen in the second container and on the value of the pressure measured by the second manometer, the residual quantity of oxygen in the second container.