Jisho

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Wikipedia definition
1. Tide gaugeA tide gauge is a device for measuring the change in sea level relative to a datum. Sensors continuously record the height of the water level with respect to a height reference surface close to the geoid. Water enters the device by the bottom pipe (far end of the tube, see picture), and electronic sensors measure its height and record it to a tiny computer. Data is available for over 1,750 stations worldwide.
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Read “Tide gauge” on DBpedia

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