Versatile Automatic Grade Lasers for Level, Grade and Vertical Alignment The Spectra Precision® GL422 Grade Laser are cost-effective, auto self-leveling lasers that do 3 jobs—level, grade and vertical alignment with plumb. Both lasers feature a two-way, full-function remote control so you can make grade changes from anywhere on the jobsite for faster setup and faster operation. The GL422 Grade Laser (dual grade) lasers send a continuous, self-leveled 360-degree laser reference over your entire work area, and have a wide grade range so they can be used in a variety of slope operations.