Professional Dual Grade Laser for Demanding Jobsite Applications
The Spectra Precision GL622N-NR is a contractor-grade dual slope laser system designed to handle the most demanding elevation control tasks on active construction sites. Whether you're establishing independent X and Y axis grades simultaneously, laying out drainage swales, or setting foundation elevations, the GL622N-NR eliminates the need for repeated instrument setups and manual grade calculations. Paired with the HL760 digital grade rod receiver, this system delivers fast, accurate results from a single instrument position — saving time and reducing costly errors on every pour, cut, or fill operation.
System Overview & Jobsite Applications
The GL622N-NR is engineered for earthwork contractors, concrete crews, utility installers, and site supervisors who need reliable grade control across flat and sloped terrain. Its dual-axis slope capability allows operators to program independent grades on both the X and Y axes, making it the go-to tool for complex drainage designs, parking lot layout, slab-on-grade work, and pipe bedding operations. The self-leveling system handles rough terrain with ease, and the rugged housing is built to withstand vibration, dust, and moisture on active jobsites. With remote control capability and a long-range receiver, the GL622N-NR keeps your crew productive across large site areas without constant trips back to the instrument.
Key Specifications
- Grade Range: ±10% on both X and Y axes simultaneously
- Accuracy: ±1.5mm at 30m (1/16" at 100 ft)
- Self-Leveling Range: ±5°
- Operating Range: Up to 300m (1,000 ft) diameter with HL760 receiver
- Rotation Speed: 100, 300, 600 RPM selectable
- Laser Class: Class 3R, 635nm visible red beam
- Power: Rechargeable battery pack — up to 100 hours runtime
- IP Rating: IP66 dust and water resistant
- Operating Temperature: -20°C to +50°C (-4°F to 122°F)
- Weight: Approx. 2.9 kg (6.4 lbs) with battery
What's in the Kit
- Spectra Precision GL622N-NR dual grade rotating laser
- HL760 digital grade rod receiver with LCD display
- Rechargeable NiMH battery pack
- AC wall charger
- RC602 remote control (where included — confirm at time of order)
- Carrying case for transport and storage
- Operator's manual and quick-start guide
Job Applications
Foundation Layout & Slab Work: Set independent X and Y slopes in a single instrument setup to establish accurate slab grades for drainage, ADA compliance, or architectural requirements — no repositioning required between axes.
Site Grading & Earthwork: Control cut and fill operations across large site areas using the long-range HL760 receiver. The remote control lets grade checkers and equipment operators verify elevation in real time without stopping work.
Drainage & Utility Trenching: Program precise pipe grades along both horizontal and vertical alignments. The digital receiver displays numeric offset values so operators know exactly how much to adjust — no guesswork, no manual math.
Parking Lot & Flatwork Construction: Establish consistent cross-slopes and longitudinal grades simultaneously for concrete or asphalt flatwork, ensuring proper surface drainage across the entire paved area.
Compatible Accessories
- HL760 Replacement Receiver — spare or upgrade receiver for multi-crew operations
- RC602 Remote Control — adjust grade settings from anywhere on site
- Spectra Precision Tripod — heavy-duty aluminum tripod for stable instrument mounting
- Grade Rod & Target Set — compatible staffs for use with the HL760 receiver
- Replacement Battery Pack — extended runtime battery for long shift operations
Related Guides
- How to Set Dual Slope Grades with a Rotating Laser
- Rotating Laser vs. Grade Laser: Choosing the Right Tool
- Using a Digital Receiver for Pipe and Utility Grading
- Spectra Precision GL600 Series Comparison Guide
Frequently Asked Questions
- Can the GL622N-NR set different grades on both axes at the same time?
- Yes. The GL622N-NR supports true simultaneous dual slope, allowing you to set an independent grade percentage on the X axis and a separate grade on the Y axis in a single instrument setup. This is ideal for complex drainage planes, cross-sloped slabs, and parking lot layouts where two-direction slopes are required.
- What is the working range of the HL760 receiver?
- The HL760 receiver is rated for use up to 300 meters (approximately 1,000 feet) in diameter from the instrument under typical outdoor conditions. Range may vary based on sunlight intensity and atmospheric conditions. The receiver's large detection window helps maintain signal lock at extended distances.
- Does this system come with a remote control?
- The GL622N-NR kit configuration may include the RC602 remote control depending on the specific package. Please confirm kit contents with our sales team before ordering. The RC602 allows full grade and function adjustment from the rod location, keeping your crew efficient on large sites.
- Is the GL622N-NR suitable for use around heavy equipment?
- Yes. The GL622N-NR features an IP66-rated housing for dust and water resistance, and is built to withstand the vibration and environmental conditions typical of active grading and earthwork sites. The instrument's self-leveling system will alert operators if the laser is disturbed beyond its compensating range, helping protect data integrity during machine operations nearby.
