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- 3 -
78
0°/45°/90°
no
1569
2Check your Spirit Level for Accuracy before the use.
You can follow these steps
• Place the level on a flat surface.
• Make one mark at the end of the level.
• Make another mark along the side of the level, under the vial in the center.
• Take a reading of the bubble's position.
• Rotate the level 180° end-to-end and align the level with your marks.
• Take another reading. If the level is accurate, the bubble will be in the same
position for both readings.
• To test the vertical vial, follow the same procedure against a flat vertical
surface.
3Use Spirit Levels
Find the horizontal, vertical, or 45 degrees vial on your level and notice its two
lines. Your level probably has two small vials or liquid-filled tubes: horizontal and
vertical. You will use the horizontal vial to find the horizontal plane. You will notice
that the vial has a bubble and two lines in the center, which are called guidelines.
• When you measure your horizontal object, and the bubble falls between the two
guidelines, it is flat, even, or “level”. Another way of thinking about this is that a
level object is completely parallel to the horizon.
• If during your horizontal measurement, you find that the bubble is outside the left
guideline, then your object’s left side is higher than your right. Likewise, if the
bubble is outside the right guideline, your right side is higher than your left.
• When you measure your vertical object, and the bubble falls between the two
guidelines, then it is completely vertical, or “plumb.” A plumb object is
perpendicular to the earth.
• If during your vertical measurement, you find that the bubble is outside the top
guideline, then your object’s top side is bulging forward. Likewise, if the bubble is
outside the bottom guideline, your object’s bottom side bulges forward.
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