Professional Dual-Axis Grade Control Built for Demanding Sitework
The Spectra Precision GL622N-27 is a contractor-grade dual slope laser engineered for complex grading applications where single-axis control simply isn't enough. Capable of setting independent grades on both the X and Y axes simultaneously, this laser gives earthwork crews, site superintendents, and civil contractors the precision and repeatability needed for large-scale drainage systems, athletic field construction, and multi-directional finish grading. Paired with the included HL760 dual-display laser receiver, the GL622N-27 delivers field-proven performance across a wide range of working conditions.
System Overview & Jobsite Applications
The GL622N-27 operates across a working range of up to 2,000 feet in diameter when used with the HL760 receiver, making it well-suited for open sitework where coverage and accuracy must coexist. The system self-levels within a ±5° automatic leveling range, dramatically reducing setup time on uneven terrain. Grade ranges of ±25% on both axes give crews the flexibility to tackle steep cross-slopes, aggressive drainage pitches, and compound geometry without switching instruments. Whether you're managing a stadium bowl, a parking lot with multi-directional drainage, or a large commercial pad, the GL622N-27 delivers repeatable, audit-ready results.
Key Specifications
- Model: GL622N-27
- Laser Class: Class IIIa / Class 3R
- Accuracy: ±1.5 arc seconds (self-leveling)
- Grade Range (X-Axis): ±25%
- Grade Range (Y-Axis): ±25%
- Working Diameter: Up to 2,000 ft with HL760 receiver
- Self-Leveling Range: ±5°
- Rotation Speed: 100, 300, 600 RPM (selectable)
- Battery Life: Up to 100 hours (4 x D-cell alkaline)
- IP Rating: IP66 — dust-tight and water-resistant
- Operating Temperature: -20°C to +50°C (-4°F to +122°F)
- Receiver Included: HL760 Dual-Sided Display Receiver
What's in the Kit
- GL622N Dual Grade Laser Transmitter
- HL760 Laser Receiver with Dual LED Display
- RC602N Remote Control (included with GL622N-27 package)
- Carrying Case
- 4 x D-Cell Alkaline Batteries
- Operator's Manual
Job Applications
Parking Lots & Commercial Pads: Set simultaneous cross-slope and fall grades in a single instrument setup, eliminating the need to re-level between axis adjustments and reducing total stakeout time on large impervious surfaces.
Athletic Fields & Stadium Bowls: Achieve the tight compound grade tolerances required for natural turf drainage and synthetic field systems, where grade consistency directly affects field certification and surface longevity.
Retention Basins & Drainage Channels: Control multi-directional flow grades on detention pond bottoms and channel inverts where both longitudinal and transverse slopes must be precisely maintained for regulatory compliance.
Large-Scale Site Grading & Road Subgrade: Coordinate machine control and grade checking across wide earthwork footprints with a stable, long-range rotating reference that holds grade through extended operational shifts.
Compatible Accessories
- HL760 Replacement Laser Receiver
- RC602N Remote Control for GL600 Series
- Spectra Precision Grade Rod & Clamp
- Tripod & Elevating Tripod for Grade Lasers
- Replacement D-Cell Battery Pack
- Hard-Shell Carrying Case for GL600 Series
Related Guides
- How to Set Dual Slope Grades with the GL622N
- GL622N vs GL612N: Which Dual Grade Laser Is Right for Your Job?
- Using a Rotating Laser for Parking Lot Drainage Layout
- HL760 Receiver Setup & Calibration Guide
Frequently Asked Questions
- Can the GL622N-27 set different grades on both axes at the same time?
- Yes. The GL622N-27 is specifically designed to set and maintain independent grades simultaneously on both the X and Y axes, up to ±25% on each. This makes it ideal for compound slope applications like stadium bowls and multi-directional drainage pads where a single-axis laser would require multiple setups.
- What receiver is included with the GL622N-27 package?
- The GL622N-27 kit includes the HL760 laser receiver, which features dual-sided LED displays for easy reading from the cab or on the rod. The HL760 is compatible with the full GL600 series and provides audible and visual grade indicators for both on-grade and off-grade conditions.
- Is the GL622N-27 compatible with machine control systems?
- The GL622N transmitter outputs a standard rotating laser plane that is compatible with many aftermarket and OEM machine control systems using laser-ready mast receivers. Check your machine control manufacturer's compatibility list to confirm integration with the GL622N signal.
- How long will the batteries last in the field?
- Running on 4 standard D-cell alkaline batteries, the GL622N is rated for up to 100 hours of continuous operation. This translates to several weeks of typical daily use without needing a battery swap, making it practical for extended site deployments where access to power is limited.
