Overview
The Spectra Precision GL622N-DR Dual Grade Laser System represents a complete grading solution engineered for professionals who demand precision and versatility on complex job sites. This comprehensive package combines the powerful GL622N-DR dual grade laser with the HL760 digital receiver and DR400 Digirod, enabling contractors to handle everything from simple leveling to sophisticated dual-slope drainage projects with a single system. Whether you're establishing building foundations, installing drainage systems, or grading parking lots, this laser package delivers the accuracy and flexibility needed to complete projects efficiently and within specification.
What sets the GL622N-DR apart is its true dual grade capability—the ability to simultaneously control two independent slopes perpendicular to each other. This eliminates the time-consuming process of repositioning equipment or using multiple lasers for complex grading applications. The included RC602N remote control allows operators to adjust laser settings from up to 300 feet away, keeping workflows efficient when working on large sites. Combined with Spectra's legendary durability and ease of use, this system delivers professional-grade performance at an accessible price point of $2,095.
The HL760 receiver provides exceptional range and precision with digital readout capabilities, while the DR400 Digirod extends your working height to 13 feet, making this system adaptable to excavators, dozers, and motor graders. This complete kit arrives ready to work, with all mounting hardware, batteries, and carrying cases included—no additional purchases required to start grading.
Key Specifications
- Laser Type: Rotating laser with dual grade capability
- Grade Range: -10% to +15% on single axis; -8% to +8% dual axis
- Accuracy: ±1/16 inch at 100 feet (±1.5mm at 30m)
- Working Diameter: Up to 2,600 feet (800m) with receiver
- Rotation Speed: 0, 60, 120, 300, 600, 900 RPM (variable)
- Self-Leveling Range: ±5 degrees
- Operating Temperature: -4°F to 122°F (-20°C to 50°C)
- Battery Life: Up to 60 hours continuous operation
- Remote Range: 300 feet (100m) line-of-sight
- Receiver Accuracy: ±1/16 inch (±1.5mm) digital readout
- DR400 Rod Height: 6 to 13 feet (1.8 to 4.0m) extended
- Weather Protection: IP66 water and dust resistance
What's in the Kit
- GL622N-DR Dual Grade Laser with dual-axis slope capability
- HL760 Digital Laser Receiver with LCD display and audible alerts
- DR400 Digirod grade rod (6-13 feet adjustable height)
- RC602N Remote Control for wireless laser operation
- Rod-mounted receiver clamp with secure locking mechanism
- Alkaline battery pack for laser (4 D-cell)
- Rechargeable NiMH battery option for receiver
- Heavy-duty hard-shell carrying case for laser
- Soft carrying case for receiver and accessories
- Operating manuals and quick-start guide
- Manufacturer's 3-year warranty documentation
Job Applications
- Site Grading and Excavation: The dual grade capability is essential for creating proper drainage on parking lots, building pads, and commercial sites where water must flow in a controlled direction. Eliminate standing water problems by establishing accurate multi-directional slopes without repositioning equipment.
- Foundation and Concrete Work: Achieve level or sloped concrete pours with confidence. The system's ±1/16 inch accuracy ensures footings, slabs, and foundations meet engineering specifications, while the remote control lets you verify elevations from the pour location without interrupting concrete placement.
- Drainage and Utility Installation: Installing sewer lines, storm drains, and French drains requires consistent slope over long distances. The GL622N-DR maintains precise grade throughout trenches up to 2,600 feet in diameter, ensuring proper flow rates and preventing costly rework from improper pitch.
- Agricultural Land Leveling: Modern farming demands precise land grading for irrigation efficiency. This system enables farmers and land improvement contractors to establish controlled slopes across fields, reducing water waste and improving crop yields through optimized drainage patterns.
- Road Construction and Paving: Road crews rely on dual grade lasers to create crowned roads with proper cross-slope for water runoff. The RC602N remote allows the equipment operator to make on-the-fly adjustments without leaving the cab, maintaining productivity on linear projects.
- Landscaping and Hardscaping: Professional landscapers use this system to grade athletic fields, golf courses, and residential yards where aesthetics and drainage must coexist. The digital receiver provides real-time cut/fill information, speeding up fine grading operations significantly.
Compatible Accessories
- Spectra Precision Machine Control Packages for excavators and dozers
- Extended-height grade rods up to 18 feet for deep excavation work
- Heavy-duty laser tripods with adjustable legs and quick-clamp heads
- Wall-mount brackets for interior construction applications
- Additional HL760 receivers for multiple-operator efficiency
- Laser enhancement glasses for improved beam visibility in bright conditions
- Rechargeable battery packs and 12V charging systems
- Weatherproof storage cases and transit cases for multi-site contractors
Related Guides
- How to Set Up and Calibrate a Dual Grade Laser System
- Complete Guide to Choosing the Right Construction Laser Level
- Understanding Laser Receivers: Detection Ranges and Accuracy
- Proper Drainage Slope Specifications for Construction Projects
FAQ
- What's the difference between single grade and dual grade lasers?
- Single grade lasers create a slope in one direction only, forming a tilted plane. Dual grade lasers like the GL622N-DR can simultaneously slope in two perpendicular directions, creating a compound slope essential for proper drainage on complex surfaces like parking lots or building pads. This eliminates the need to reposition the laser or use multiple units for multi-directional grading projects.
- How far can the receiver detect the laser beam?
- The HL760 receiver can detect the GL622N-DR laser beam at distances up to 1,300 feet in radius (2,600-foot diameter) under normal conditions. Detection range decreases in extremely bright sunlight or dusty conditions. For maximum range, use the laser at higher rotation speeds (600-900 RPM), though this may slightly reduce accuracy for close-range work.
- Can this system be mounted on excavators or grading equipment?
- Yes, the GL622N-DR is fully compatible with machine control systems. While this package includes the handheld DR400 Digirod for manual grade checking, the HL760 receiver can be mounted on excavator buckets, dozer blades, or motor grader moldboards using compatible machine mounting brackets (sold separately). This enables automated grade control with real-time elevation feedback to operators.
- Is the system difficult to set up and level each day?
- No, the GL622N-DR features automatic self-leveling within ±5 degrees, which handles setup in under 60 seconds in most situations. Simply position the laser on stable ground or a tripod, power it on, and the internal leveling mechanism establishes a reference plane automatically. The RC602N remote lets you set grades and make adjustments without touching the laser, even from inside equipment cabs up to 300 feet away.
