The present invention avoids confusion in the L-axis, T-axis, and H-axis, and prevents the contact of foreign matter by forming a constant gap with the lower surface when used, and arranges the leveling system in the L-axis direction and the T-axis direction A T-axis portion which is formed horizontally and is expressed in units of T axes; A first L-axis portion formed at right angles to the T-axis portion and expressed in L-axis units; A second L-axis portion formed at right angles to the T-axis portion together with the first L-axis portion; A right angle measuring unit formed at a right angle to the upper surface of the T axis portion, the first L axis portion, and the second L axis portion, the T axis unit being formed on one side and the L axis unit being formed on the other side; A horizontal measuring unit mounted in the T axis direction and the L axis direction of the surface formed by the T axis part, the first L axis part, and the second L axis part; And a gap maintaining portion formed to protrude from each corner of the surface formed by the T axis portion, the first L axis portion, and the second L axis portion and forming a predetermined gap with the surface to be used.
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