Spectra Precision GL1425C-BL Dual Grade Laser Bluetooth / NO Receiver, NO Remote, No Case - LASER ONLY

Overview

The Spectra Precision LL300S-17 Complete Package delivers the tools concrete contractors, site developers, and utility crews need for precision grading and elevation control. This turnkey system combines the self-leveling LL300S rotary laser with the HL760 digital receiver, a tenths-calibrated grade rod, and professional-grade mounting equipment. Contractors working flatwork, footings, underground utilities, and site preparation benefit from the decimal-precision rod calibration that eliminates fraction conversion errors during layout and verification. The LL300S provides ±10 arc second accuracy with automatic leveling across 5° of tilt, while the HL760 receiver offers millimeter-level detection sensitivity across a 1,000-foot diameter working radius. This complete package ships ready for jobsite deployment without requiring additional accessories or calibration.

Key Specifications

• Laser Model: Spectra Precision LL300S (Single Slope)
• Leveling Accuracy: ±10 arc seconds (±3/32" at 100 feet)
• Self-Leveling Range: ±5 degrees
• Working Diameter: Up to 1,000 feet (305 m) with HL760 receiver
• Rotation Speed: 600 RPM
• Receiver Model: HL760 Digital Laser Receiver
• Receiver Detection Accuracy: ±1/16" (±1.5 mm) standard mode
• Rod Calibration: Tenths (decimal feet: 0.1, 0.2, 0.3...)
• Rod Length: Extends to 25 feet
• Power Source: Rechargeable NiMH battery (laser); 2 AA batteries (receiver)
• Run Time: 60+ hours per charge (laser)
• Operating Temperature: -4°F to 122°F (-20°C to 50°C)
• IP Rating: IP66 (dust-tight, water-resistant)
• Tripod Thread: 5/8"-11
• Warranty: 3-year manufacturer warranty

What's in the Kit

• Spectra Precision LL300S Single-Slope Rotary Laser
• HL760 Digital Laser Receiver with Rod Clamp
• 25-Foot Telescoping Grade Rod (Tenths Calibration)
• Heavy-Duty Aluminum Tripod with Quick-Clamp Legs
• Rechargeable NiMH Battery Pack for Laser
• 110V AC Battery Charger with Power Cord
• Remote Control for Laser Functions
• Hard-Shell Carrying Case for Laser
• Soft Carrying Case for Receiver
• Rod Bag with Shoulder Strap
• Operator Manuals and Quick Start Guides

Job Applications

• Concrete Flatwork and Floor Slabs: The tenths-calibrated rod eliminates conversion calculations when establishing and verifying slab elevations to engineered drawings specified in decimal feet. The HL760's digital readout shows exact cut/fill measurements for screed rail setup and final grade verification.
• Footing and Foundation Layout: Single-slope capability allows contractors to establish consistent depth control across stepped footings or sloped foundations while maintaining accurate elevation references. The 1,000-foot working diameter covers entire building pads without instrument relocation.
• Underground Utility Installation: Precise grade control ensures proper flow rates in gravity-fed sewer, storm drain, and water lines. The decimal rod calibration matches civil engineering plans while the IP66 rating protects equipment in trenching conditions with dust and water exposure.
• Site Grading and Cut/Fill Operations: Track excavation progress and verify final grades against plan elevations using the tenths rod that corresponds directly to surveyor benchmarks and grade stakes. The long working range minimizes setup moves on large development sites.
• Parking Lot and Pavement Grading: Establish drainage slopes for asphalt and concrete paving with the LL300S's single-axis slope function. The digital receiver provides real-time elevation feedback to equipment operators or grade checkers verifying subgrade preparation.
• Retaining Wall and Masonry Construction: Maintain consistent course elevations and wall heights across long runs using the laser as a reference plane. The tenths rod allows direct correlation to architectural elevations without converting between feet-inches-fractions and decimal measurements.

Compatible Accessories

Expand system capabilities with these Spectra Precision accessories:

• HL450 Economy Receiver — Budget-friendly backup receiver for multi-crew operations
• Laser Detector Target Card — Visual alignment aid for machine control and layout tasks
• Alkaline Battery Tray — Field-replaceable power option eliminating charging downtime
• RC601 Long-Range Remote — Extended-range remote for large-site applications
• Laser Enhancement Glasses — Improve beam visibility in bright outdoor conditions
• Replacement Tenths Grade Rod — Additional rod for simultaneous multi-point checks

Related Guides

• Complete Guide to Rotary Laser Setup and Calibration
• Tenths vs. Eighths Grade Rods: Which Calibration for Your Work?
• Understanding Laser Receiver Detection Accuracy
• Troubleshooting: Rotary Laser Won't Self-Level

Frequently Asked Questions

What's the difference between tenths and eighths rod calibration?

Tenths rods display decimal feet (5.1, 5.2, 5.3 feet) matching civil engineering drawings and surveyor benchmarks, eliminating conversion calculations. Eighths rods show feet, inches, and fractional inches (5' 1", 5' 2", 5' 3") preferred by carpenters and residential builders. For concrete, utility, and site work where plans specify decimal elevations, tenths calibration prevents measurement errors from fraction-to-decimal conversion.

Can the LL300S be used for drainage slopes or just level applications?

The LL300S includes single-axis slope capability, allowing you to set grade in one direction from -10% to +10% using the control panel or remote. This makes it suitable for parking lot drainage, utility line slopes, and foundation grades. The laser remains level in the perpendicular axis, so it creates a tilted plane rather than a compound slope.

How far can the HL760 receiver detect the laser beam?

The HL760 provides a working diameter of up to 1,000 feet (500-foot radius) in typical conditions. Effective range depends on ambient light, with maximum distance achieved during overcast conditions or indoor use. In bright direct sunlight, practical range reduces to approximately 600-700 feet diameter. The receiver features sensitivity adjustment to optimize detection in varying light conditions.

Is this system accurate enough for professional concrete flatwork?

Yes. The LL300S delivers ±10 arc second leveling accuracy, equivalent to ±3/32" over 100 feet, meeting ASTM and ACI tolerance requirements for concrete floor construction. Combined with the HL760 receiver's ±1/16" detection accuracy, the system provides the precision necessary for warehouse floors, tilt-up panels, and commercial slabs. Regular calibration verification ensures continued accuracy.