A line laser projects one or more laser lines on walls, floors or ceilings. Most line lasers have at least two laser lines, one horizontal and one vertical, which together form a cross. The line lasers shown here are horizontally and vertically automatically aligned. The line lasers replace spirit levels and allow easy aligning of construction elements or decorations.
For some lasers, the use of a line laser receiver is possible. With the laser receiver, one is no longer dependent on the visibility of the laser line. This enlarges the operating range and makes levelling operations in bright light (e.g. sunlight) possible.