The leveler sits between the tripod's axis and the head. When setting up with a leveler the first step is to level the head. This makes the pan axis vertical, ensures that the horizon won't move up or down when panning. Much more useful for cinematography, which is why I got one, that for still photography. Not absolutely necessary for still photography but I wouldn't do without one in the field.
I don't work in a studio, suspect that in a studio with level floors there's really no need for a leveler.
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