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Bathometer and Interferometer

noun

  • An instrument that measures the depth of water.
(n.) An instrument for measuring depths, especially one for taking soundings without a sounding line.

noun

  • Any measuring instrument that uses interference patterns to make accurate measurements of waves. .
(n.) An instrument for measuring small movements, distances or displacements by means of the interference of two beams of light; -- called also refractometer.