Abstract: The invention relates to a vertical indicator unit for measurement comprising placing a float in a vessel filled with a liquid, supporting the vessel with an external supporting frame, securing a doughnut-like magnet integrally with the outside of the lower end portion of the float, connecting a vertical supporting rod to a hinge contact point at the lower end of the external supporting frame, securing a separate funnel-like doughnut magnet to the upper end head portion of the vertical supporting rod, reversely polarizing both the magnets for diamagnetically repulsively maintaining both the magnets from each other at a certain air space, inserting the head portion of the vertical supporting rod into the inner space of the upper vessel, and vertically maintaining the vertical supporting rod with respect to a predetermined position of the lower portion of the supporting frame by diamagnetism of the doughnut-like magnet of the float and the funnel-like magnet provided in the head portion of the vertical supporti