Built for Tenths-Based Grading on Complex Drainage and Earthwork Projects
The Spectra Precision GL622N-17 is a professional dual-grade rotating laser configured for tenths-of-foot measurement — the standard unit used in domestic drainage design, site grading plans, and civil earthwork specifications. When your engineer's plans call out slopes in tenths, this laser reads and sets grades in the same language, eliminating conversion errors in the field. Drainage contractors, grading crews, and civil earthwork teams trust the GL622N series for its rugged build, reliable self-leveling, and straightforward dual-slope operation.
Overview and Jobsite Applications
The GL622N-17 operates on the same proven platform as the broader GL622N series, delivering two independently controlled grade planes in a single rotating head. Set X-axis and Y-axis slopes simultaneously without repositioning — critical for parking lot drainage, athletic field contouring, agricultural land forming, and any project where surface water control is the primary objective. The included HL760 receiver extends working range and enables machine control or rod-and-grade work across large open sites.
Key Specifications
- Grade Range: ±10% on both X and Y axes simultaneously
- Grade Accuracy: ±1.5 arc seconds (±0.0003 ft/ft)
- Self-Leveling Range: ±5°
- Measurement Display: Tenths-of-foot (0.1 ft increments)
- Working Range: Up to 2,000 ft diameter with HL760 receiver
- Rotation Speed: 150, 300, or 600 RPM selectable
- Power: Rechargeable NiMH battery pack, up to 100 hours runtime
- Protection Rating: IP66 dust and water resistant
- Operating Temperature: -20°C to +50°C (-4°F to +122°F)
What's in the Kit
- GL622N-17 dual grade rotating laser transmitter
- HL760 laser receiver with clamp
- Rechargeable NiMH battery pack and charger
- Carrying case
- Operator's manual
Job Applications
Site Drainage and Grading: Set precise cross slopes and longitudinal grades simultaneously for parking lots, driveways, and commercial pads where tenths-based drainage plans are the standard deliverable from civil engineers.
Athletic Field Construction: Crown and slope athletic turf fields with controlled dual-axis grades to direct surface runoff without visible low spots or ponding — a job where tenths accuracy is the difference between a playable surface and a maintenance headache.
Agricultural Land Forming: Land-level or precision-grade crop fields with tight slope tolerances for irrigation efficiency and uniform drainage across large open acreage.
Road and Curb Subgrade: Establish subgrade cross-slopes and profile grades simultaneously during road base prep, matching civil plan sheets that specify grade in tenths of a foot.
Compatible Accessories
- HL760 Laser Receiver (replacement/additional)
- Spectra Precision CR600 Machine Control Receiver
- Elevator Tripod for Grade Lasers
- NiMH Rechargeable Battery Pack
- Spectra Precision HL450 Hand-Held Receiver
Related Guides
- How to Set Dual Grade with the GL622N Series
- Tenths vs. Hundredths: Choosing the Right Laser Configuration
- GL622N-17 vs GL622N-27: Which Model Is Right for Your Work?
- Using a Rotating Grade Laser for Parking Lot Drainage
Frequently Asked Questions
- What is the difference between the GL622N-17 and the GL622N-27?
- Both models share the same laser platform and grade range. The GL622N-17 displays and resolves grades in tenths of a foot, which matches domestic drainage and grading plan standards. The GL622N-27 is configured for hundredths-of-foot measurement, preferred for finish grading, concrete flatwork, and applications requiring finer resolution.
- Does the GL622N-17 work with machine control systems?
- Yes. The included HL760 receiver is compatible with blade and bucket control interfaces on motor graders and dozers. For fully integrated machine control, the Spectra Precision CR600 receiver offers direct machine control output compatibility.
- Can I set grade on both axes at the same time?
- Yes — that is the core advantage of a dual grade laser. The GL622N-17 allows you to independently set X-axis and Y-axis slopes simultaneously in a single setup, eliminating the need to reposition the instrument to achieve compound grades.
- What is the maximum working range with the HL760 receiver?
- The GL622N-17 with the HL760 receiver delivers a working diameter of up to 2,000 feet, making it well-suited for large open grading sites, agricultural fields, and commercial site work where long-range grade transfer is required.
