Now you can get the same quality, reliability, and sound, innovative engineering you expect from Bosch Power Tools in a new line of measuring and layout tools. For precision and durability to help you work smarter, better, faster - take another look at the name that you already know. The Self-Leveling Three-Line Laser gives you three laser lines, one for finding horizontal,and two vertical lines plus an added plumb down point making it easy to find level, align, plumb and square applications.