Tiling your bathroom or placing a handrail is not possible without the Stanley Fatmax FMHT77585-1. This cross line laser projects a horizontal and vertical line on the wall (also separately from each other), so that you always finish your jobs straight out. The maximum range of the laser is 20 meters. The laser is self-leveling with a range of 4 degrees. This automatically aligns the line laser. You attach the laser to the wall with the included holder.