| 摘要 |
A self-leveling tool for projecting a line of light along a wall or other vertical surface at one of a plurality of predetermined angles. The tool self-aligns to emit a plane of light at one of the predetermined angle (e.g., 0,90, 180 or 270 degrees), thereby projecting a line on a wall in a desired direction (e.g., right up, left or down). |
