Versatile Automatic Grade Lasers for Level, Grade and Vertical Alignment The Spectra Precision® Laser GL512 and GL522 Grade Lasers are cost-effective, automatic self-leveling lasers that do three jobs—level, grade and vertical alignment with plumb. Both lasers feature a 2-way, full-function remote control so you can make grade changes from anywhere on the jobsite for reduced setup time and faster operation. ............ Includes: GL512 laser, RC402 two-way radio remote control, HL750 receiver, ATI994005-99 clamp, Q104234 NiMH rechargeable battery pack with Q102733 charger, Q104207 Carry Case and multi-language manual.