The Bosch GLL 30 is an excellent laser line level that is accurate and versatile with great projection abilities. This level is light and has a compact design. It comes with a clamp mount that you can attach to a variety of surfaces and has standard tripod threading.
This is a self-leveling laser line level, meaning you don't have to adjust the level to make it project a plumb line. You can place the laser line up to four degrees out of level and the internal pendulum will adjust the difference. If the laser line level is placed at a greater degree out of level, an LED at the top of the unit turns red and the projected lines flash. If you bump or move the level while it is in self-leveling mode, it only takes about three seconds to find level again.
This level projects a visible line up to 30 feet away, accurate up to 3/16 of an inch, which is the most accurate out of all the levels we reviewed. On top of that, the level projects the horizontal line at 120 degrees – not the most impressive angle we have seen, but still noteworthy. With this wide projection range, you can cast a level line across two walls at once.
The Bosch GLL 30 is a light, compact unit that is easy to carry and move around. The tool requires two AA batteries, which power it for approximately 15 hours. This battery life is not the best out of the laser lines we reviewed, but it is significant, and you won’t have to worry about keeping spare batteries with you at all times.
This laser line level has standard, quarter-inch tripod threading, which means you can use most camera tripods to set it up. Included with the level is a clamp mount that extends up to 2 1/2 inches, allowing you to attach it to many surfaces. However, it’s missing mounting options such as a magnetic mount, a suction cup mount and an adhesive mount. Any of these would increase the usefulness of this device.
The Bosch GLL 30 is an effective tool that’s easy to set up and use. The cross-line laser level projects lines at a wide angle, allowing you to cast a line across an entire room, which can save you the time of finding the same level line over and over. This level can also project an accurate line against a surface up to 30 feet away, which isn't the best we have seen but is still impressive.