Overview
The Spectra Precision LL300N-8 Laser Package combines the self-leveling LL300N rotary laser with the HR320 handheld receiver, creating a versatile horizontal reference system built for large-scale site work. This configuration delivers ±1/16-inch accuracy at 100 feet with operational range extending up to 1,300 feet radius using the HR320 detector. The LL300N operates as a single-grade horizontal laser, eliminating the complexity and cost of dual-grade systems when elevation reference is your primary requirement. Ideal for contractors running long-distance drainage, establishing building elevations across expansive footprints, or setting grade on highway projects where traditional leveling methods become labor-intensive. The system self-levels within ±5 degrees, features automatic grade monitoring, and ships ready for immediate deployment with all mounting hardware, batteries, and protective storage.
Key Specifications
- Accuracy: ±1/16 inch at 100 feet (±1.5 mm at 30 m)
- Working Range: 1,300-foot diameter (400 m) with HR320 receiver
- Self-Leveling Range: ±5 degrees with audible out-of-level alert
- Rotation Speed: 0, 150, 300, 600, 900, 1,500 RPM (6 settings)
- Beam Type: Class 3R visible red laser, 635 nm
- Power: Alkaline D-cell batteries (60+ hours) or rechargeable NiMH option
- Operating Temperature: -4°F to 122°F (-20°C to 50°C)
- Environmental Rating: IP66 dust-tight and water-resistant
- Receiver Accuracy: ±1/16 inch (1.5 mm) digital readout with audible tones
What's in the Kit
- Spectra Precision LL300N horizontal rotary laser
- HR320 handheld laser receiver with clamp bracket
- RC301 single-axis remote control (200-foot range)
- Alkaline battery pack for laser
- 9V alkaline battery for receiver
- Soft-sided carrying case with foam inserts
- Target plate for indoor alignment work
- Quick-start operation guide and calibration certificate
Job Applications
- Site Excavation and Rough Grading: Establish a consistent horizontal plane across acres of cut-and-fill operations without constant instrument moves. The 1,300-foot diameter coverage lets operators check grade with the HR320 mounted on equipment or grade rods, reducing downtime and survey crew dependency.
- Foundation and Slab Elevation Control: Set building pad heights and verify formwork elevation on commercial and industrial projects. The visible red beam remains easy to acquire indoors, while the HR320's digital display shows exact deviation from grade for precise screeding and placement verification.
- Storm Drainage and Utility Trenching: Maintain proper fall over extended runs by setting the laser at invert elevation. Backhoe and excavator operators use the receiver-mounted equipment bracket to monitor trench depth continuously, ensuring gravity-flow systems meet engineered slopes without over-excavation.
- Highway and Roadway Construction: Establish centerline and edge-of-pavement elevations during subgrade preparation. The system's range handles typical lane widths and median work from a single setup, while six rotation speeds adapt to bright sunlight conditions or close-proximity interior work.
- Concrete Formwork Alignment: Level wall forms, screed rails, and falsework across multi-bay structures. Remote control operation allows one-person grade adjustments without accessing the instrument, critical when the laser is positioned on scaffolding or in congested areas.
- Agricultural Land Leveling: Guide land planes and scrapers during field grading operations for irrigation efficiency. Battery runtime exceeds full work shifts, and the ruggedized construction withstands dust and vibration inherent to agricultural earthmoving equipment.
Compatible Accessories
Spectra Precision HL450 Digital Receiver (enhanced range and two-sided detection)
HR500 Machine Receiver (equipment-mount with relay outputs)
Heavy-Duty Elevating Tripod (5/8×11 thread, extends to 10 feet)
Rechargeable NiMH Battery Pack (replacement for alkaline pack)
15-Foot Aluminum Grade Rod (tenths scale with receiver clamp)
Laser Detector Plate (for tight-tolerance indoor work)
Related Guides
Rotary Laser Setup and Daily Calibration Procedures
Single-Grade vs. Dual-Grade Lasers: Choosing the Right System
Maximizing Laser Receiver Accuracy on Active Job Sites
Troubleshooting: Laser Won't Self-Level or Constant Beeping
Frequently Asked Questions
- Can the LL300N be used for vertical layout or plumb applications?
- No, the LL300N is a horizontal-only rotary laser. The beam plane self-levels to horizontal reference and cannot be oriented vertically. For dual-axis or vertical plumb work, consider the Spectra LL400 series or dedicated pipe lasers for confined applications.
- What's the actual working range I can expect with the HR320 receiver on bright job sites?
- Effective range depends on ambient light and rotation speed. In direct sunlight, expect 600-800 feet diameter at higher rotation speeds (900-1,500 RPM), which narrows the beam and improves detectability. In overcast conditions or shade, the full 1,300-foot diameter is readily achievable. The receiver's sensitivity adjustment and audio tones help acquisition even when visual confirmation is difficult.
- How often does the LL300N require professional calibration?
- Spectra recommends annual factory calibration or whenever the unit experiences impact or environmental extremes. However, perform the two-point accuracy check monthly: set up at midpoint between two grade rods 200 feet apart, compare readings, rotate laser 180 degrees, and verify deviation stays within ±1/8 inch total. Consistent deviation indicates calibration drift requiring service.
- Can I use this laser in automatic grade-matching mode without manual slope input?
- The LL300N is a single-grade horizontal laser without electronic slope capability—it self-levels to true horizontal only. To set slope, you physically tilt the entire laser using the adjustable tribrach or mounting surface. For electronic dual-axis grade control (X and Y slopes), you need a dual-grade model like the LL500 with grade-matching receiver systems.
