Overview
The Spectra Precision GL412N-26 Single Grade Laser represents the gold standard for contractors who demand precision, durability, and versatility in their grading operations. This comprehensive laser package combines Spectra's legendary GL412N single-slope laser with the advanced CR700 digital receiver, a rugged inches-graduated rod, and a professional-grade tripod—everything needed to establish accurate grades on construction sites, agricultural projects, and drainage installations.
Engineered for professionals who work in imperial measurements, this system delivers ±1/16 inch accuracy at 100 feet, making it ideal for foundation work, concrete pours, excavation, and precise slope applications. The GL412N features dual-axis capability with manual slope adjustment up to 10% in one direction, allowing operators to establish complex drainage patterns, parking lot grades, and athletic field contours with confidence. Its self-leveling technology compensates for minor setup imperfections, while the robust construction withstands the punishing conditions of active jobsites.
The included CR700 receiver extends your working range significantly beyond line-of-sight limitations, providing both visual and audible grade indicators that help equipment operators maintain precise elevations even in bright sunlight or dusty conditions. When paired with the inches-graduated rod and stable tripod, this complete system eliminates guesswork and reduces costly rework, paying for itself through improved efficiency and accuracy on your very first major project.
Key Specifications
- Accuracy: ±1/16 inch at 100 feet (±1.5mm at 30m)
- Working Diameter: Up to 2,600 feet (800m) with CR700 receiver
- Self-Leveling Range: ±5 degrees
- Slope Capability: Manual single-axis slope adjustment up to 10%
- Rotation Speed: 600 RPM (standard), 900 RPM (optional for extended range)
- Power Source: Rechargeable NiMH battery with 60+ hour runtime
- Operating Temperature: -4°F to 122°F (-20°C to 50°C)
- Receiver Detection Range: 6-inch (150mm) detection window
- Grade Measurement: Imperial (inches) graduated leveling rod
- Dust/Water Resistance: IP66 rated protection
- Laser Class: Class 2 visible red beam
- Warranty: 3-year manufacturer's warranty
What's in the Kit
- GL412N Single Grade Laser Transmitter with carrying case
- CR700 Digital Laser Receiver with rod clamp
- Inches-graduated aluminum leveling rod (extends to 16 feet)
- Heavy-duty aluminum tripod with adjustable legs
- Rechargeable NiMH battery pack
- AC battery charger with vehicle adapter
- Remote control for laser functions
- Protective hard-shell carrying case for laser
- Quick-start guide and complete operating manual
- Calibration certificate
Job Applications
- Foundation and Concrete Flatwork: Achieve perfectly level foundations, warehouse floors, and parking structures where elevation precision directly impacts structural integrity and drainage performance. The GL412N's ±1/16 inch accuracy ensures concrete pours meet stringent specifications, reducing callbacks and ensuring proper water runoff.
- Site Excavation and Grading: Guide excavator and dozer operators to exact cut and fill elevations across large construction sites. The CR700 receiver's 2,600-foot range covers entire building pads, while the audible alerts allow operators to maintain grade without constantly checking visual displays, dramatically improving productivity.
- Agricultural Drainage and Land Leveling: Create precise field slopes for optimal irrigation water flow and drainage in farming operations. The single-slope capability lets you establish controlled gradients for furrow irrigation, ensuring uniform water distribution that maximizes crop yields while minimizing water waste and soil erosion.
- Parking Lot and Roadway Construction: Establish accurate cross-slopes and longitudinal grades for proper stormwater management in paving projects. The system's ability to set and maintain consistent slopes ensures compliance with drainage specifications and ADA requirements, preventing water pooling and premature pavement failure.
- Landscape Grading and Athletic Fields: Build sports fields, golf courses, and recreational areas with the precise elevations necessary for proper playability and drainage. The laser's stability and accuracy ensure crown heights and pitch specifications meet athletic standards while preventing water accumulation that damages turf.
- Utility Trenching and Pipeline Installation: Maintain proper slopes in sewer, stormwater, and drainage pipe installations where gravity flow depends on consistent gradients. The CR700 receiver mounts directly on excavation equipment or grade stakes, giving installers immediate feedback to achieve the 1-2% slopes typically required for gravity flow systems.
Compatible Accessories
- RC703 Machine Receiver for direct equipment mounting
- HL700 Horizontal/Vertical Laser Receiver for dual-axis applications
- Extended-life lithium-ion battery pack upgrade
- Laser enhancement glasses for improved beam visibility
- Magnetic vehicle mount for transportation and charging
- Grade matching sensor for automated slope duplication
- Fiberglass leveling rod (metric or inches options)
- Elevator tripod with precision center column
- Remote display for monitoring from multiple locations
- Protective rain cover for extended outdoor use
Related Guides
- Complete Laser Level Selection Guide: Choosing Between Single Grade, Dual Grade, and Rotary Lasers
- Maximizing Accuracy: Laser Receiver Setup and Calibration Best Practices
- Site Grading Fundamentals: Understanding Slopes, Elevations, and Drainage Requirements
- Laser Equipment Maintenance: Protecting Your Investment for Long-Term Precision
FAQ
- What's the difference between single grade and dual grade lasers?
- Single grade lasers like the GL412N create a slope in one direction only, making them ideal for drainage lines, parking lots, and simple grading applications. Dual grade lasers can create slopes in two directions simultaneously, which is necessary for complex applications like building pads with corner-to-corner drainage. For most contractors focused on drainage, trenching, and straightforward grading work, the single grade laser offers excellent value and simpler operation.
- How far can I work from the laser with the CR700 receiver?
- The CR700 receiver provides reliable detection up to 1,300 feet radius from the laser (2,600 feet diameter working area). Actual range depends on ambient light conditions, with maximum distances achievable during overcast days or early morning/late afternoon work. In bright midday sunlight, effective range may reduce to 800-1,000 feet radius. For extended range applications, you can increase the laser's rotation speed to 900 RPM.
- Can this system be used for vertical applications like wall forming or building layout?
- While the GL412N is primarily designed for horizontal grading and slope applications, it can be rotated 90 degrees using an optional mounting bracket to create a vertical reference plane. However, for dedicated vertical work, wall forming, or comprehensive building layout, a true rotary laser with dual-axis capability would provide more versatility. The GL412N excels at what it's designed for: precise horizontal grading and single-direction slopes.
- Is the inches-graduated rod necessary, or can I use a metric rod?
- The inches-graduated rod is specifically included for contractors working in imperial measurements common in U.S. construction. You can absolutely substitute a metric rod if your projects require metric specifications—the laser and receiver work with either measurement system. Express Tools offers metric rod options separately, and the CR700 receiver displays elevation differences in the measurement units corresponding to your rod graduations, making conversions seamless.
