2550b Official

Under the 2550B standard (most recently updated as SMEWW 2550B:2017 or SMEWW 2550B:2023), the following guidelines apply:

It is typically an in-situ or direct field measurement. Because water temperature changes rapidly once a sample is removed from its source, 2550B emphasizes measuring the sample immediately at the collection point. Under the 2550B standard (most recently updated as