Level the X Axis and the Y Axis.
Zero return all Axes.
Make sure the rotary table is clean.
Put the CNC dual leveling tool on the rotary table. Make sure the long side is parallel to the tee-slots.
Adjust the 1, 12, 11, 10, and 9 (left-hand side) feet or the 3, 4, 5, 6, and 7 (right-hand side) feet  until the bubble is in the center of the level.
Put the level perpendicular to the tee-slots.
Adjust the 1,2, and 3 (rear) feet  or the 7, 8, and 9 (front) feet until the bubble is in the center of the level.