What is the principle of this instrument for measuring flatness and verticality to achieve accurate measurement? There will be a leveling tube on the level, and liquid will form bubbles on the inner wall. When measuring, the measurement result will be judged based on the reading of the bubble at rest. When the level is tilted, the bubbles will be automatically Move to the other end to determine where the water level should be. The common magnetic level on the market can be placed directly on the measuring work surface. The radius of curvature of the inner wall of the measuring tool determines whether the precision can be clearly displayed. The key is no, so the higher the radius of curvature, the more worthy the choice is to ensure accurate measurements.