Stock Photo - 28 July 2021, Hamburg: An algae oximeter (l) and a daphnia oximeter for observing water fleas (Latin: Daphnia magna), taken during a press event for the reopening of the Bunthaus water quality monitoring station. Among other things, a water quality measuring network with a total of nine fixed measuring stations continuously provides information on the condition of Hamburg's flowing waters. Following extensive refurbishment, the station at Bunthausspitze is now resuming operations. Photo: Georg Wendt/dpa. - Hamburg/Hamburg/Germany

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