The Spectra Precision Laser GL522 dual grade transmitters are rugged, cost-effective, automatic self-leveling lasers that do three jobs—level, grade, and vertical alignment.

• Automatic electronic self-leveling provides fast, easy horizontal level, grade, and vertical plumb setup
• Large compensated grade range from -10% to +15%
• Quick setups with the 2-way radio remote control, and single and dual grade application capability
• Electronic Leveling Vibration Filter dampens vibrations typically experienced on tall tripods, in high winds, or on high vibration jobsites
• No rework due to automatic temperature and grade compensation
• Grade Match displays the existing grade over unknown ground and eliminates time consuming and error prone calculations, time spent searching for grade plans, and over excavating
• PlaneLok automatically locks on to an existing elevation or vertical alignment point which eliminates all drift or possibility of error due to improper calibration or weather
• Very rugged with low service costs; takes a 1 m drop on concrete
• Mask mode eliminates interference with other crews on the jobsite

• General construction leveling such as forms, footers and pads
• Precision placement of concrete for critical specification surfaces over long distance and with laser controlled screeds (Automatic PlaneLok)
• Drift free general construction vertical alignment and plumb for anchor bolt installation, plus form, tilt up and curtain wall plumbing (Automatic PlaneLok)
• General construction grading and excavating
• Steep slope road embankments and ditch banks
• Sports fields, driveways, ramps and drainage