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Overview
The Spectra Precision GL412N-17 Single Grade Laser represents the ideal balance between precision measurement and straightforward operation for contractors who need reliable single-slope grade control. This complete kit combines Spectra's proven laser technology with the HL760 digital receiver, a professional TENTHS-graduated leveling rod, and heavy-duty tripod—everything required to establish accurate grades on drainage projects, foundation work, and site preparation jobs. Unlike dual-slope systems that add complexity for applications that don't require it, the GL412N-17 focuses on doing one thing exceptionally well: maintaining precise single-direction slope across distances up to 1,600 feet diameter. The tenths-rod graduation system allows you to measure and communicate elevations in decimal feet rather than fractional inches, streamlining calculations and reducing errors when working from engineering plans. Whether you're setting forms for concrete slabs, establishing drainage grades, or performing site excavation, this system delivers professional-grade accuracy with the durability to withstand demanding job site conditions.
Key Specifications
- Accuracy: ±1/8 inch at 100 feet (±3mm at 30m)
- Working Diameter: Up to 1,600 feet (500m) with receiver
- Slope Range: Single axis, -10% to +10% in X or Y direction
- Self-Leveling Range: ±5 degrees
- Rotation Speed: 0, 150, 300, 600, 900 RPM (variable)
- Receiver Type: HL760 Digital Display with on-grade indicators
- Rod Graduation: TENTHS system (decimal feet for simplified calculations)
- Power Source: Rechargeable NiMH battery with AC/DC charger option
- Battery Life: Up to 40 hours continuous operation
- Environmental Rating: IP66 water and dust resistance
- Operating Temperature: -4°F to 122°F (-20°C to 50°C)
- Mounting: 5/8 x 11 threaded mount (included tripod compatible)
What's in the Kit
- GL412N-17 Grade Laser: Single-slope rotating laser transmitter with protective carrying case
- HL760 Digital Receiver: Rod-mounted detector with digital display and audio indicators
- TENTHS Leveling Rod: Professional-grade measuring rod with decimal foot graduations (typically 8-foot or 25-foot model)
- Heavy-Duty Aluminum Tripod: Adjustable height tripod with quick-clamp legs and laser mounting platform
- Rechargeable Battery Pack: NiMH battery with charging system
- RC601 Remote Control: Wireless remote for adjusting slope and rotation settings from the rod position
- Laser Safety Glasses: Enhances beam visibility in bright conditions
- Carrying Cases: Weather-resistant storage cases for laser, receiver, and accessories
- Calibration Certificate: Factory calibration documentation
- User Manual: Complete operating instructions and maintenance guidelines
Job Applications
- Foundation Excavation and Formwork: Establish precise elevations for foundation excavation depths and formwork positioning. The tenths-rod system matches how architectural and engineering plans specify foundation elevations, eliminating conversion errors between fractional and decimal measurements during layout.
- Concrete Slab Grading: Set accurate grades for concrete floor slabs, parking lots, and flatwork. The single-slope capability is perfect for applications requiring drainage fall in one direction, while the laser's consistent reference plane ensures uniform thickness and proper drainage without multiple benchmark measurements.
- Drainage and Utility Trenching: Maintain proper pitch for drainage systems, sewer lines, and utility installations. The HL760 receiver provides real-time elevation feedback as trenches are excavated, ensuring continuous fall toward discharge points while the 1,600-foot range covers extended utility runs without repositioning.
- Site Preparation and Rough Grading: Control cut-and-fill operations during site development. Equipment operators can use the receiver on grader blades or excavator buckets to achieve target elevations efficiently, while the robust IP66 rating withstands dust and water exposure typical of earthmoving operations.
- Agricultural Land Leveling: Create precise field grades for irrigation efficiency and drainage control. The long working range and single-slope functionality suit agricultural applications where consistent fall across large areas prevents water pooling and optimizes irrigation distribution.
- Retaining Wall and Terracing: Establish level or sloped reference lines for retaining wall construction and landscape terracing. The remote control allows one-person operation to adjust grades without returning to the tripod, improving productivity on projects with multiple elevation transitions.
Compatible Accessories
- RC601N Remote Control: Additional wireless remote for multi-crew operations
- HL700 Economy Receiver: Basic rod-mounted receiver for budget-conscious applications
- Receiver Rod Clamps: Universal clamps for mounting HL760 on various rod styles
- Extended Leveling Rods: 16-foot and 25-foot TENTHS rods for deeper excavations
- Heavy-Duty Tripod: Reinforced tripod for unstable ground conditions
- Laser Detector Packages: Machine-mounted receivers for equipment grade control
- Replacement Battery Packs: Additional NiMH batteries for extended runtime
- 12V Vehicle Charging Adapter: Charge battery from truck power
- Wall/Floor Mounting Brackets: Interior mounting hardware for building construction
Related Guides
- Complete Grade Laser Setup Guide: Achieving Accurate Slope Control
- Understanding TENTHS vs. Inches Rod Systems: Which to Choose
- How to Read Laser Receivers: Mastering the HL760 Display
- Construction Laser Maintenance: Protecting Your Investment
FAQ
- What is the advantage of TENTHS rod graduations over traditional inch markings?
- TENTHS rods display measurements in decimal feet (0.10 ft, 0.20 ft, etc.) rather than fractional inches, matching how most construction plans specify elevations. This eliminates conversion calculations between feet-and-inches and decimal measurements, reducing errors and speeding up grading operations. For example, instead of converting 3 feet 6 inches to 3.5 feet, you read it directly as 3.5 on the rod.
- Can the GL412N-17 create dual-axis slopes or just single-direction grades?
- The GL412N-17 is a single-axis grade laser, meaning it creates slope in one direction (either X or Y axis) while remaining level in the perpendicular direction. This is ideal for drainage applications and utility trenching where you need consistent fall in one direction. If you require slope in two directions simultaneously (for applications like crowned parking lots), you would need a dual-slope model like the GL422N or GL522.
- What is the effective working range in typical job site conditions?
- With the HL760 receiver, the GL412N-17 provides up to 1,600 feet diameter working range (800-foot radius). In bright sunlight conditions, effective range may reduce to 600-800 feet diameter, while early morning, evening, or overcast conditions allow maximum range. For interior applications or controlled lighting, you can achieve full range consistently. The variable rotation speed (up to 900 RPM) helps extend range in bright conditions.
- Is this system accurate enough for concrete flatwork and foundation applications?
- Yes, with ±1/8 inch accuracy at 100 feet, the GL412N-17 exceeds typical construction tolerances for concrete slabs, foundations, and grading work. Most concrete flatwork specifications allow ±1/4 inch in 10 feet, and this laser maintains tighter tolerance across much greater distances. The system includes factory calibration certification and should be verified periodically using Spectra's calibration procedures outlined in the user manual to maintain accuracy.
