GB/T 30432-2013 "Liquid Piston Pressure Gauges" standard specifies the basic parameters, technical requirements, test methods, inspection rules, marking, Encasement and storage requirements of liquid piston pressure gauges. This standard applies to piston pressure gauges with a load applied to the piston by directly or through a load-bearing device (rod) and the working medium is liquid. It is used for pressure gauges with a measurement upper limit of 250 MPa or less (including 250 MPa). The standard provides detailed technical specifications and guidance for the design, production, inspection and use of liquid piston pressure gauges. The standard also refers to a series of normative reference documents, including GB/T 264 (petroleum products acid value determination method), GB/T 265 (petroleum products kinematic viscosity determination method and dynamic viscosity calculation method), GB/T 13384 (mechanical and electrical products Encasement general technical conditions), etc., to ensure compliance with the provisions of these documents. The standard also specifies that the Accuracy level of the pressure gauge is 0.02 and 0.05. The basic parameters should be selected according to the requirements in Table 1, providing users with guidance on the selection and use of liquid piston pressure gauges.