We put the trust of one of the most important data referring to our safety, if not the most important, the air pressure of the tank, to an extremely simple and imprecise instrument, the analogic manometer, a copper spiral through which a hole detects the pressure and shows the reading in a sphere by the moving of a needle. With DIGI 2 Cressi proposes a high precision instrument that also provides other data of constant interest to the diver. All with a very contained size and cost.