Overview
The Spectra Precision GL412N-14 is a professional-grade single-slope laser system engineered for contractors who demand millimeter-level accuracy in finish grading operations. At the core of this package is Spectra's proven single-grade laser transmitter, capable of establishing a precise reference plane across distances up to 2,000 feet in diameter. What distinguishes this configuration is the inclusion of the CR700 receiver—a high-sensitivity detector designed specifically for tight-tolerance applications where material waste and re-work directly impact profitability. The system ships with the RC402N remote control, allowing single-operator setup and real-time grade adjustments from up to 1,000 feet away without returning to the instrument. This is a turnkey solution for paving contractors, site development firms, and concrete placement specialists working under specifications that permit minimal deviation from design grade. The GL412N delivers ±1/8-inch accuracy at 100 feet, meeting or exceeding tolerances required for DOT pavement projects, commercial slab-on-grade work, and sports field construction.
Key Specifications
- Accuracy: ±1/8 inch (±3mm) at 100 feet
- Working Diameter: Up to 2,000 feet (600m) with CR700 receiver
- Grade Range: Single-axis grade: -10% to +10% in X or Y axis
- Self-Leveling Range: ±5 degrees with automatic compensation
- Rotation Speed: 600 RPM (Class 2 visible laser)
- Power: Rechargeable NiMH battery; 60+ hour runtime
- Environmental Rating: IP66 dust-tight and water-resistant; operates -20°F to 122°F
- CR700 Receiver Accuracy: ±1/16 inch (±1.5mm) digital readout
- Remote Range: RC402N controls transmitter up to 1,000 feet
What's in the Kit
- GL412N Single Grade Laser Transmitter with NiMH battery
- CR700 Laser Receiver with rod clamp and digital display
- RC402N Wireless Remote Control
- Heavy-duty hard-shell carrying case with custom foam insert
- 110V AC battery charger with vehicle 12V adapter
- Operating manuals and quick-start laminated guide
Job Applications
- Asphalt Paving & Milling: Establish precise elevation control for screeds and automated grade control systems on pavers. The CR700's high sensitivity ensures your crew catches grade changes immediately, preventing costly tears or low spots that require remediation after compaction.
- Concrete Slab Placement: Control laser screed elevations for warehouse floors, tilt-up panels, and commercial foundations where FF/FL flatness specifications are contractual requirements. The system's ±1/16-inch receiver resolution supports Super Flat floor tolerances (FF50+).
- Site Rough & Finish Grading: Guide dozer blades, motor graders, and excavator buckets equipped with mast-mounted receivers during mass earthwork and final grade operations. Single-slope capability handles parking lots, building pads, and drainage swales with consistent cross-slope.
- Sports Field Construction: Precision grading for athletic fields, golf courses, and recreational surfaces where drainage performance depends on accurate crowns and slopes. The 2,000-foot diameter covers entire fields from a single setup point.
- Underground Utility Trenching: Set consistent trench bottoms for storm, sanitary, and water lines. Receiver accuracy ensures proper bedding depth and fall rates, reducing callbacks for settlement or drainage failures.
- Landscape & Hardscape Grading: Control elevations during base preparation for pavers, retaining walls, and decorative concrete. Remote operation eliminates the need for a dedicated instrument operator on smaller crews.
Compatible Accessories
HL700 Horizontal/Vertical Receiver | RC402N Replacement Remote | C59 Universal Rod Clamp | 14-Foot Aluminum Grade Rod | Heavy-Duty Detector Pole with Fine Adjustment | Laser Enhancement Glasses (Red Beam) | Machine Control Mounting Packages
Related Guides
Single-Grade vs. Dual-Grade Lasers: Which Does Your Project Need?
Spectra GL412N vs. Topcon RL-H5A Comparison
Understanding Laser Receiver Sensitivity and Detection Range
Troubleshooting Calibration Drift in Rotating Lasers
Frequently Asked Questions
- Can the GL412N create dual slopes for complex drainage applications?
- No. The GL412N is a single-grade laser, meaning it can establish slope in one axis (X or Y) at a time, but not compound slopes. For projects requiring simultaneous two-axis grading—such as complex parking lot drainage or crowned roads—you'll need a dual-grade system like the Spectra GL622N or GL722.
- What is the practical working range with the CR700 receiver in bright sunlight?
- The CR700 provides reliable detection up to 1,000 feet radius in typical outdoor conditions. In direct, harsh sunlight, effective range may reduce to 600-800 feet depending on atmospheric conditions. For maximum visibility in bright environments, use laser enhancement glasses and position the laser to minimize sun interference on the detector face.
- How does the RC402N remote improve efficiency on single-operator jobs?
- The RC402N allows you to power the laser on/off, adjust grade settings, and change rotation speed without returning to the tripod. For a solo operator checking elevations across a large site, this eliminates hundreds of feet of walking per day. Grade changes can be made from the work area, confirmed with the receiver, and locked in—all without a second crew member at the instrument.
- Is this system compatible with machine control installations on excavators and dozers?
- Yes. The GL412N transmitter works with most aftermarket and OEM machine control systems that accept rotating laser input. You'll need to source the appropriate mast, mounting hardware, and machine-specific receivers from your machine control provider. The CR700 included in this kit is designed for handheld rod work, not permanent machine mounting.
