Professional Dual-Slope Laser Control for Demanding Jobsites
The Spectra GL422N-19 is a complete dual grade laser package built for contractors who need accurate, repeatable slope control across concrete, grading, and drainage applications. Whether you're setting cross-slopes on a parking lot, managing complex drainage grades, or controlling a concrete pour on a slab with dual pitch requirements, the GL422N delivers the precision and reliability that professional crews depend on every day. This package ships ready to work, bundling the GL422N laser head with the HL760 smart numeric receiver, a TENTHS graduated grade rod, and an elevator tripod so your crew can set up and start shooting grade immediately on arrival.
System Overview & Jobsite Applications
The GL422N operates as a self-leveling rotating laser with independent X and Y axis slope control, giving you the flexibility to dial in a single cross-slope or simultaneous dual-axis grades from a single instrument setup. The built-in grade matching feature lets operators drive to a known grade point and lock the laser to that slope automatically — a major time saver on large pours and finish grading operations. With a working range of up to 2,000 feet in diameter when paired with the HL760 receiver, this system covers sprawling commercial sites without requiring instrument moves. Robust construction and sealed electronics keep the GL422N running through dust, moisture, and the general punishment of active construction environments.
Key Specifications
- Grade Range: ±10% on both X and Y axes simultaneously
- Accuracy: ±1.5 arc seconds (self-leveling)
- Self-Leveling Range: ±5° automatic compensation
- Working Diameter: Up to 2,000 ft with HL760 receiver
- Rotation Speed: 100, 300, or 600 RPM selectable
- Battery Life: Up to 100 hours on 4 D-cell alkaline batteries
- Ingress Protection: IP66 dust and water resistant
- Receiver: Spectra HL760 with numeric grade display and audio/visual guidance
What's in the GL422N-19 Kit
- Spectra GL422N Laser Head — dual grade rotating laser with remote-ready design
- Spectra HL760 Receiver — numeric display with ±0.05 ft grade readout, rod bracket, and adjustable audio
- TENTHS Graduated Grade Rod — direct reading in tenths for fast, accurate cut/fill calls
- Elevator Tripod — heavy-duty adjustable tripod for stable instrument height positioning
- Batteries and Carrying Case — D-cell batteries included; padded case for transport and storage
Job Applications
Concrete Flatwork & Slab Pours: Set dual-axis slopes across large commercial slabs with a single instrument setup. The GL422N holds grade through the pour so screed operators maintain consistent elevation control from edge to edge without repeated checks.
Parking Lot & Hardscape Grading: Dial in cross-slopes and longitudinal grades simultaneously for proper surface drainage on asphalt and concrete paving projects. Grade matching ensures the laser locks to your design slope at the control point.
Drainage & Pipe Installation: Maintain consistent invert grades for storm drain, sanitary sewer, and culvert work. The HL760 receiver gives your rod person a numeric cut/fill readout so grade calls are fast and accurate.
Finish Grading & Site Prep: Use the GL422N from a central setup to control finish grades across an entire pad or building site, reducing instrument moves and keeping your grade crew working efficiently.
Compatible Accessories
- Spectra RC602 Remote Control — adjust grade and rotation speed from the machine cab
- Spectra HL760 Replacement Receiver — spare or replacement numeric receiver
- Machine Mount Bracket — mounts HL760 to blade or bucket for machine control applications
- Replacement D-Cell Battery Pack — OEM battery kit for extended field operations
- Spectra Carrying Case — replacement padded instrument case
Related Guides
- How to Set Dual Grade with the Spectra GL422N
- GL422N vs GL422N-14 Package Comparison
- Choosing the Right Rotating Laser for Concrete Work
- Using the HL760 Receiver for Grade Calls on Large Pours
Frequently Asked Questions
- Can the GL422N set two different slopes at the same time?
- Yes. The GL422N controls X and Y axis slopes independently, allowing you to set simultaneous dual grades — for example, a 1% longitudinal slope and a 2% cross-slope — from a single instrument setup without any additional equipment.
- What is the grade matching feature and how does it work?
- Grade matching allows the GL422N to automatically detect and lock to an existing slope rather than requiring you to manually dial in a grade value. You position the instrument over a known grade plane and activate grade match — the laser reads the slope and sets itself to match it, saving significant setup time on retrofit or tie-in work.
- Is the GL422N-19 compatible with machine control receivers?
- The GL422N is designed to work with Spectra machine-mounted receivers like the HL760 when fitted with a machine bracket. For full cab-controlled machine grading, the optional RC602 remote control allows grade and speed adjustments from the operator seat without leaving the machine.
- What is the difference between the GL422N-19 and other GL422N packages?
- The -19 package designation identifies the specific kit configuration, which includes the HL760 numeric receiver, a TENTHS graduated rod, and an elevator tripod. Other package suffixes may include different receivers, rods, or accessories. The GL422N laser head itself is identical across all package variants.
