The Spectra Precision GL622N-BL is a professional-grade dual slope laser transmitter designed for contractors who demand accurate, simultaneous cross-slope and longitudinal slope control on large-scale earthwork and civil grading projects. Sold as a bare laser unit, the GL622N-BL integrates seamlessly with your existing Spectra Precision detector and grade rod setups, making it a cost-effective upgrade or replacement for seasoned grading crews. With an operating range of up to 2,000 feet in diameter and rugged IP66-rated weather resistance, this instrument is built to perform in demanding field conditions.
Built for Large-Scale Grading Operations
The GL622N-BL excels on jobsites where single-axis lasers fall short. Its dual-slope capability allows operators to set independent grade percentages on both the X and Y axes simultaneously—eliminating the need for repeated setups when transitioning from longitudinal to cross-slope verification. This makes the GL622N-BL the go-to instrument for highway subgrade preparation, landfill cell construction, detention pond grading, commercial site development, and airport apron drainage design. The self-leveling range of ±5° handles uneven terrain setups, while the motorized head ensures rapid, repeatable grade changes without manual adjustment.
Key Specifications
- Laser Class: Class IIIa (Class 3R), 635 nm visible red beam
- Grade Range: ±25% on both X and Y axes simultaneously
- Self-Leveling Range: ±5° automatic
- Operating Range: Up to 2,000 ft (610 m) diameter
- Grade Accuracy: ±1.5 arc seconds (standard deviation)
- Rotation Speed: 100, 300, 600 RPM selectable
- Power: Internal rechargeable battery — up to 100 hours runtime
- Weather Protection: IP66 dust and water resistant
- Operating Temperature: -20°C to +50°C (-4°F to 122°F)
- Weight: Approximately 5.3 lbs (2.4 kg)
Key Features
- Simultaneous dual-axis grade control for X and Y slopes in a single setup
- Motorized grade head with remote-compatible operation via HL760 or compatible receiver
- Smart oscillating scan mode for increased detector sensitivity at long range
- Automatic out-of-level shutoff with audible and visual alerts
- Large, backlit LCD display for easy grade reading in bright sunlight
- Robust die-cast aluminum housing rated IP66 for all-weather field use
- Compatible with Spectra Precision HL760 and HR320 machine control receivers
- Long 100-hour battery life reduces downtime on multi-day projects
Job Applications
Highway & Road Subgrade: Set simultaneous crown and longitudinal grades for subbase compaction verification across wide roadway corridors without repositioning equipment.
Landfill Cell Construction: Achieve precise multi-directional slopes required for liner system installation and leachate collection system compliance grading.
Commercial Site Drainage: Lay out complex parking lot and detention basin grades where ADA cross-slope tolerances and stormwater flow directions must both be maintained.
Agricultural Land Leveling: Control field slope in two directions simultaneously for irrigation efficiency and uniform drainage across large agricultural parcels.
Compatible Accessories
- Spectra Precision HL760 Laser Receiver — High-sensitivity detector for machine and hand-grade applications
- Spectra Precision HR320 Machine Control Receiver — For motor grader and dozer integration
- Spectra Precision HL450 Laser Receiver — Budget-friendly detector for hand-grade crews
- Spectra Precision RC602 Remote Control — Wireless grade adjustment from the machine cab
- Heavy-Duty Tripod for Grade Lasers — Stable platform for long-range setups
- Spectra Precision Carrying Case for GL Series — Protective transport and storage case
Frequently Asked Questions
- Does the GL622N-BL include a receiver or grade rod?
- No. The GL622N-BL is a bare laser unit only and does not include a laser receiver, grade rod, tripod, or remote control. This configuration is ideal for contractors who already own compatible Spectra Precision receivers and want a transmitter-only purchase. Compatible receivers include the HL760, HL450, and HR320.
- What is the difference between the GL622N and the GL622N-BL?
- The GL622N typically refers to a packaged kit that includes a receiver and carrying case, while the GL622N-BL (Bare Laser) is the transmitter unit sold alone. Both share the same core laser transmitter hardware and performance specifications.
- Can the GL622N-BL be used with machine control systems?
- Yes. The GL622N-BL is compatible with Spectra Precision machine control receivers such as the HR320, enabling integration with motor graders, dozers, and scrapers for automated grade control on earthmoving equipment.
- What is the maximum grade percentage the GL622N-BL can achieve?
- The GL622N-BL supports grade settings of up to ±25% on both the X and Y axes simultaneously, covering the full range of slopes encountered in highway, drainage, and earthwork applications.
Frequently Asked Questions
Does the GL622N-BL include a receiver or grade rod?
No. The GL622N-BL is a bare laser unit only and does not include a laser receiver, grade rod, tripod, or remote control. This configuration is ideal for contractors who already own compatible Spectra Precision receivers and want a transmitter-only purchase. Compatible receivers include the HL760, HL450, and HR320.
What is the difference between the GL622N and the GL622N-BL?
The GL622N typically refers to a packaged kit that includes a receiver and carrying case, while the GL622N-BL (Bare Laser) is the transmitter unit sold alone. Both share the same core laser transmitter hardware and performance specifications.
Can the GL622N-BL be used with machine control systems?
Yes. The GL622N-BL is compatible with Spectra Precision machine control receivers such as the HR320, enabling integration with motor graders, dozers, and scrapers for automated grade control on earthmoving equipment.
What is the maximum grade percentage the GL622N-BL can achieve?
The GL622N-BL supports grade settings of up to ±25% on both the X and Y axes simultaneously, covering the full range of slopes encountered in highway, drainage, and earthwork applications.