Piston type pressure gauge as a pressure force dissemination of important measurement standard device. Piston type pressure gauge measuring process, and a series of practical experience of the operator level have very high requirements. Piston type pressure gauge measuring multifarious operation process will cause the subjective intend to introduce other error measuring workers. These factors influence the accuracy of the dissemination. Especially in the process of leveling the piston, not quite the experience accumulated and piston type pressure gauge handle is simply can't do. The introduction of differential pressure transmitter to the measurement process of piston manometer ,simplifies the operation process, make the piston type pressure gauge measurement is more easy to learn and master, ensure the pressure forces the dissemination of accurate and reliable.