All machines eventually will develop cracks, when and where depends on many factors. Some are caused by factory defects, these type will probably show up sooner rather than later.
Read more: Say no to crack(s)
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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.
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