The Spectra Precision LL300S-81 PRO is a complete, job-ready rotary laser package engineered for grading crews and site contractors who demand precision on every pass. Whether you're expanding a fleet, replacing an aging single-grade unit, or equipping a second crew, this kit delivers everything needed to set grade, control elevation, and maintain tight tolerances from the moment you arrive on site. The PRO configuration pairs Spectra's reliable LL300S rotary laser with a professional-grade HR320 receiver, tenths rod, heavy-duty tripod, rechargeable battery pack, and a rugged carrying case — no separate sourcing required.
Product Overview & Jobsite Applications
The LL300S-81 PRO is built around a single-slope red-beam rotary laser capable of grade settings from -10% to +10%, making it a natural fit for drainage, finish grading, flatwork preparation, and utility trench work. The self-leveling mechanism compensates for minor setup variations and alerts the operator when the instrument is out of level — a critical safeguard on uneven terrain. Paired with the HR320 receiver, crews get extended range detection up to 2,000 feet in diameter, enabling large excavation sites to be controlled from a single instrument setup. The tenths-rod configuration accelerates grade checks and final verification without requiring a separate metric conversion step on the field.
Key Specifications
- Laser Type: Red-beam rotary, single slope
- Grade Range: -10% to +10% on X-axis
- Self-Leveling Range: ±5°
- Working Diameter: Up to 2,000 ft (610 m) with HR320 receiver
- Rotation Speed: 100, 300, or 600 RPM selectable
- Accuracy: ±1/16 in at 100 ft (1.5 mm at 30 m)
- IP Rating: IP66 — dust-tight and waterproof
- Power: Rechargeable NiMH battery pack; up to 40 hours runtime
- Receiver: Spectra Precision HR320 with audible and visual grade indication
What's in the Kit
- Spectra Precision LL300S rotary laser instrument
- HR320 machine-control-compatible laser receiver
- Tenths-graduated grade rod for direct field readings
- Heavy-duty adjustable tripod for stable instrument mounting
- Rechargeable NiMH battery pack with AC wall charger
- Rugged molded carrying case for transport and storage
- Operator's manual and quick-start reference card
Job Applications
Finish Grading & Site Prep: Set a single-slope grade across parking lots, athletic fields, or commercial pads and let the HR320 guide your blade or screed work with consistent elevation feedback at range.
Concrete Flatwork: Establish a uniform reference plane for slab-on-grade pours. The tenths rod allows finishers to verify grade tolerance quickly during pour and screed operations without slowing crew pace.
Drainage & Utility Trenching: Dial in positive drainage grades on storm sewer runs, retention pond banks, and swales where consistent slope is required over long distances.
Secondary Crew or Fleet Expansion: The LL300S-81 PRO is a proven choice for contractors adding a second laser to cover simultaneous operations across a split site or running independent grading and elevation crews.
Compatible Accessories
- Spectra Precision HR320 Replacement Receiver
- Spectra Precision LL300S Rechargeable Battery Pack
- Heavy-Duty Laser Tripod (Upgrade)
- Grade Rod Clamp & Bracket Kit
- Spectra Precision Carrying Case Replacement
Related Guides
- How to Set Single-Slope Grade with a Rotary Laser
- LL300S vs. LL500 — Which Laser Is Right for Your Crew?
- Rotary Laser Receiver Comparison: HR320 vs. HL760
- Site Laser Maintenance & Calibration Best Practices
Frequently Asked Questions
- Can the LL300S-81 PRO be used on a machine-mounted application?
- The LL300S is primarily designed for grade rod and tripod use. The included HR320 receiver is compatible with mast-mounted machine control setups, but for full machine-mounted laser operation, Spectra's LL500 or HV302 series is recommended for higher vibration tolerance.
- What is the battery life on the rechargeable pack?
- The included NiMH rechargeable battery pack provides up to 40 hours of continuous runtime under typical operating conditions. A fully depleted pack recharges in approximately 8 hours using the included AC wall charger.
- Does the LL300S work in outdoor daylight conditions?
- Yes. While the red-beam laser is visible at short distances, the HR320 receiver is the primary detection method outdoors and is rated for up to 2,000 ft working diameter in full daylight, making it effective on large open sites without shade or enclosed conditions.
- Is this package covered under a warranty?
- Spectra Precision backs the LL300S with a limited 3-year instrument warranty. The HR320 receiver and accessories carry a 1-year warranty. Express Tools is an authorized dealer, so warranty service and registration are fully supported through standard Spectra Precision channels.
