http://laserlevelguide.net - Leveling tools have been in existence since the duration of Egyptians. Today, modern versions in the A-frame levels Egyptians use are available for sale. These are spirit levels, used by carpenters and surveyors to determine if a surface is straight. They still leave some room for error because you cannot measure entire surfaces all at once, though they are effective. A straight line laser makes up for that limits of spirit levels. Using laser light technology, it draws a straight line across your working surface, helping you see more accurately if your project is level. The straight line works as a physical guide, making adjustments easy and precise. The lines stay straight unless they hit a deflective surface, and they are visible regardless of the lighting condition.

James - These tools also provide their limits. Manually adjusted laser levels could be inaccurate depending on your input. Spirit levels have the identical problem, and you may need to use both and recalibrate up until you reach the right settings. Obtain an automated laser line level with automatic adjustment settings instead. You might also use lasers with spirit levels as guides.