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This International Standard describes the performance testing of on-line sensors/analysing equipment for water. The standard is applicable to most sensors/analysing equipment, but it is recognized that, for some sensors/analysing equipment, certain performance tests cannot be carried out. This International Standard ? defines an on-line sensor/analysing equipment for water quality measurements; ? defines terminology describing the performance characteristics of on-line sensors/analysing equipment; ? specifies the test procedures (for laboratory and field) to be used to evaluate the performance characteristics of on-line sensors/analysing equipment.