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Summary: Different ways of plumbing the laser of a laser line level are discussed in this free educational video series.
"Hi, this is Jon on behalf of Expert Village. In this video clip we will be plumbing the laser. To plumb the laser just means that the laser is pointing straight up and down and it's not going off to one side or the other side. When plumbing a laser we need to take a close look at our bubble level that is built in and you need to turn that until that bubble is located right in the center between both of those lines. When it's in the center that tells me that the laser is perfectly plumb. Now if you want to double check to make sure that your bubble level is accurate, let's say if you accidentally had dropped it and you're just verifying that everything is correct, go ahead and line up that bubble where it should be. Take another level and place it up next to that line and then just verify that your line is plumb."
eHow Article: How to Plumb the Laser of a Laser Line Level