The second type of eye level can be used in the same manner as the first for determining level, the only difference being that the line inside the instrument will be lined up with the zero mark on the degree wheel in the level instead of a bubble.

Determining height

When heights are calculated using the percentage scale the distance from the object to the level are presumed to be measured horizontally.

Eventually as an operator you will be called upon to excavate in an area that has very wet unstable ground.