For large-sized vertical tanks and spherical tanks in petroleum and petrochemical industries, it is often difficult to see the liquid level height of the magnetic flap level gauge when standing on the ground. Our company has improved the scale of the conventional magnetic flap level gauge by observing the scale from a position above the 4th floor to create a panel that is convenient for customers to see the liquid level height. The panel has been widened and the font has been enlarged, allowing large-sized containers to have a more intuitive view of the liquid level at higher positions.