Abstract: If the standard metal gauge level deviates from the due verification position or is not adjusted due to human factors, it will easily lead to the slant between the working state and the due state of the gauge. To determine the impact of such deviation, the spatial geometric relationship between the measuring neck and the level tube is analyzed to determine the function of the deviation of the level measurement caused by the slant. The principle of common level-compensated metal gauges is analyzed, and the functional relationship between several different forms of level compensation is given. On this basis, recommendations are made for selecting level-compensated gauges with vertically aligned level tubes. The slant between the measuring neck, level tube, scale and the main part generated in the production process is analyzed, and it is concluded that the installation tilt has no effect on the measurement results.