Spectra Precision LL300N-1 Laser Package TENTHS-Rod and Tripod

Overview

The Spectra Precision LL300N-1 Laser Package serves grading contractors, site preparation crews, and utility excavation teams who require precise elevation control across medium-to-large job sites using decimal-foot measurements. This complete kit pairs the LL300N self-leveling rotary laser with the HL450 digital receiver, a 15-foot tenths-graduated aluminum rod, and heavy-duty tripod—eliminating the need to convert fractions to decimals during stakeout and cut/fill operations. With a 1,000-foot diameter working range and ±3-arc-second leveling accuracy, this package maintains repeatable grade reference points for foundation pads, parking lot subgrades, drainage trenches, and laser-guided equipment setups where tenths-based rod readings streamline field calculations and reduce layout errors inherent in fraction-to-decimal conversion.

Key Specifications

• Leveling Accuracy: ±3 arc seconds (±1/8 inch at 100 feet)
• Working Diameter: 1,000 feet (305 m) with HL450 receiver
• Self-Leveling Range: ±5 degrees
• Rotation Speed: 0, 150, 300, 600, 900 RPM (variable)
• Power Source: Rechargeable NiMH battery (included) or 4 D-cell alkaline
• Battery Life: 50+ hours (rechargeable), 70+ hours (alkaline)
• Operating Temperature: –4°F to 122°F (–20°C to 50°C)
• Dust/Water Protection: IP66 (complete dust-tight, heavy rain resistant)
• Receiver Type: HL450 digital display with audible beeper
• Rod Graduations: Tenths of a foot (0.01' increments)
• Rod Length: 15 feet extended, 4.9 feet collapsed
• Tripod Type: Heavy-duty aluminum elevator tripod with 5/8×11 thread
• Grade Matching: Manual X- and Y-axis slope adjustment
• Warranty: 3 years laser, 1 year receiver

What's in the Kit

• LL300N self-leveling rotary laser
• HL450 digital laser receiver with clamp
• 15-foot aluminum tenths-graduated rod with carrying case
• Heavy-duty aluminum elevator tripod
• Rechargeable NiMH battery pack
• 110V AC battery charger
• Hard-shell carrying case for laser and receiver
• Remote control (RC402N) for laser operation
• Laser safety glasses (red tint)
• Operating manual and quick-start guide

Job Applications

• Foundation Excavation and Forming: The tenths-based rod eliminates fraction-to-decimal conversion errors when checking footing depths and formwork elevations against benchmark datums recorded in decimal feet on survey plats and engineering drawings.
• Site Grading and Cut/Fill Operations: Skid-steer and dozer operators reference the rotating laser beam while rod crews verify cut/fill quantities in tenths, matching the decimal format used in earthwork takeoffs and GPS stake-out coordinates without calculation delays.
• Concrete Slab and Flatwork Preparation: Screed crews establish consistent subgrade elevations for warehouse floors, parking decks, and paving underlayment where tenths-precision ensures uniform thickness and reduces concrete waste from over-pour.
• Utility Trench Grade Control: Storm and sanitary sewer installations require precise fall (0.01' to 0.02' per foot) across long runs; the digital receiver and tenths rod provide real-time grade verification as pipe is bedded and backfilled.
• Drainage Swale and Detention Basin Shaping: Landscaping and erosion-control contractors verify multi-plane slopes and bottom elevations where the 1,000-foot range covers entire basin footprints from a single laser setup, reducing instrument moves.
• Parking Lot and Roadway Subgrade Preparation: Paving crews check base course elevations at grid intervals using the tenths rod to match municipal plan sheets and maintain specified crown or cross-slopes before asphalt placement.

Compatible Accessories

Expand system capabilities with these factory-compatible components:

• Spectra HL700 Receiver — Extended 1,300-foot range with dual-LCD displays
• RC402N Remote Control — Duplicate remote for two-person crews
• Alkaline Battery Tray — Field-swappable D-cell backup power
• Magnetic Laser Detector Card — Blade-mount beam locator for machine control
• 25-Foot Tenths Aluminum Rod — Extended reach for deep excavations
• Composite Heavy-Duty Tripod — Lighter alternative with same 5/8×11 mount

Related Guides

• Tenths vs. Eighths Rods: Which Graduation System for Your Work?
• Spectra LL300N vs. LL400HV: Range and Accuracy Comparison
• Field Calibration Checks for Rotary Lasers
• Troubleshooting: Laser Won't Self-Level or Flashes Error

Frequently Asked Questions

Can I use this laser with an eighths-graduated rod if I already own one?

Yes—the LL300N laser and HL450 receiver work with any rod graduation style. However, mixing tenths and eighths creates conversion errors; most contractors standardize on one system across all instruments. This kit includes the tenths rod because municipal plans and GPS coordinates use decimal feet.

What's the actual working range in bright sunlight without a receiver?

Visible range for the naked eye or manual rod checking is approximately 100–150 feet in full sun. The HL450 receiver extends usable range to 1,000-foot diameter (500-foot radius) by detecting the beam electronically, making it essential for site work beyond small residential lots.

How often does this laser need professional calibration?

Spectra recommends annual calibration for the LL300N if it's used daily or after any drop or vehicle impact. Perform monthly field checks by rotating the laser 180 degrees and comparing readings—if the difference exceeds 1/4 inch at 100 feet, send it for factory calibration. The included manual details the bump-test procedure.

Will the rechargeable battery hold charge during winter storage?

NiMH batteries self-discharge approximately 20–30% per month when idle. Before storing the laser for more than two weeks, fully charge the battery, then remove it from the instrument and store separately in a climate-controlled area. Recharge before field use. Many contractors keep alkaline D-cells as backup power during cold-weather work when rechargeable performance drops.