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"Hanging your pictures in a straight line or cutting a straight piece of wood can be very frustrating. A laser level can make the job a lot easier. Laser levels come with various features and prices range from as little as $20 to a few thousand, depending on what you need. Take this quiz to find out about laser levels."^^<http://www.w3.org/2001/XMLSchema#string>
<http://home.howstuffworks.com/laser-level-quiz16.htm>