Instrument is composed of two parts: one is the mechanical pointer to indicate the pressure gauge; the other is the transformation of the Department and the electronic amplifier. The former by the measuring system and the shell part of the instructions part of the instrument for the splash-proof structure, Good sealing, it can protect the internal structure of institutions from mechanical damage and contamination intrusion. The latter including converters and electronic amplifiers. Amplifier components coated with room temperature vulcanized silicone rubber surface, so it has good corrosion resistance and anti-tide performance.