An instrument for indicating wave height and wave number has been designed, constructed, extensively caribrated and subjected to preliminary testing in two-dimen-sional wave from April 1965 through January 1967.
　This wave height meter consists of step type pick-up and electronic digital counter. The principle of this instrument is like follows. Pulses are generated by transistor switching systems in digital counter when each contact point of a pick-up is touched to water surface.
　And then by presetting the wave number, the instrument counts the wave number and indicate the total sum of wave height and stops measuring after recording the wave height in the given wave number.
　This instrument is useful to measure irregular wave height in the model test and others.