Employed a long time ago in dimensional control, the mecanical pneumatic system EL-JET, is the most advanced and more precise up to a MICRON in our conditions. The capabilities of eliminating solid residual and liquide thanks to the air pressure of the pneumatique assembly allowing the various posts that are close to each other without any problems. One of the most interresant appliances is the multiple mesurements. For example, verificating simultaneosly diameters and heights and also diameters and conical distances, etc.