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Leveling in two directions (x- and y-directions):
(1) Perform leveling in one direction (x-direction, for example) by the method of "Leveling in
one direction."
(2) Practice leveling in the other direction (y-direction) by the same procedure.
(3) When the object under measurement is moved in seeking leveling in one direction, the
level in the other direction may be disrupted. However, repeating Steps (1) and (2) several
times will gradually bring the indication closer to zero in both directions.
When you always have a zero indication, it means that leveling in two directions has been
achieved.