This standard specifies the composition, technical requirements, test methods, inspection rules and signs, Encasement, transportation and storage, etc. of multiparameter water quality meters. Multiparameter water quality meters suitable for the measurement of seawater. A series of normative documents are referenced, including marine monitoring specifications, basic environmental test methods for marine instruments, etc. The terms and definitions include multiparameter water quality meters, devices used for the measurement of seawater temperature, salinity, dissolved oxygen, pH, Oxidation-reduction potential and other parameters. The product consists of underwater machines and aquatic machines. The design and production can increase or decrease Measurement parameters and set the working mode according to the user request.