Incredibly useful tool. I have used it for hanging frames or shelves but will use it for any construction projects as well. So you can unlock it and the laser will level itself (up to a point) meaning you just have to draw the line where you want it and you know it's level. The green laser is VERY visible even in a well-lit room. If you have trouble with red line lasers, try green, the human eye sees green much better than red. If I had to ask for anything, it would be rechargeable. Little problem. Another permanent addition to my toolbox. highlighted.
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