A device that measures sea level, which is used to quantify tides and the size of tsunamis.
Apparatus for determining the level of the sea.
A device for measuring water level as a function of time, and which is referenced to tidal benchmarks through periodic leveling surveys.
A device for measuring the height of tide. It may be simply a graduated staff in a sheltered location where visual observations can be made, or it may consist of an elaborate recording instrument (sometimes called a marigraph) making a continuous graphic record of tide height against time. Such an instrument is usually actuated by a float in a pipe communicating with the sea through a small hole which filters out shorter waves.
An instrument for measuring the rise and fall of the tide (water level).
Photo courtesy of NOAA Office of Coast Survey
