Stone walls are a kind of masonry construction that has been used for thousands of years. The first stone walls were constructed by farmers and primitive people by piling loose field stones into a dry stone wall. Later, mortar and plaster were used, especially in the construction of city walls, castles, and other fortifications before and during the Middle Ages. These stone walls are spread throughout the world in different forms. One of the best example is the Cyclopean Wall in Rajgir, India.
At the bank side of rivers, lakes and seas, generally, a scale is marked or a rod is erected on the stone wall of the bank side, a scale is carved on the stone wall to measure the water level, but dueto fluctuation of water waves, water fluctuates up and down on the scale, and the measured numerical value is not accurate enough. The invention aims to design a water level meter which is not easy to fluctuate due to fluctuation of water waves.