The Spectra Precision LL300N-7 rotary laser package delivers dependable single-grade elevation control for contractors who need repeatable results across a range of ground-level applications. Bundled with the HL760 laser receiver, this kit is engineered for utility trenching, rough grading, foundation layout, and drainage work on residential and light commercial jobsites. With a 300-meter working diameter and rugged, weather-resistant construction, the LL300N-7 is a trusted mid-range workhorse that keeps crews on grade from the first shot to the last.
Product Overview
Designed for general contractors, utility crews, and site graders who require accurate, consistent elevation references without the complexity of dual-grade or dual-axis systems, the LL300N-7 simplifies everyday layout tasks. The instrument self-levels quickly, allowing crews to set up fast and start working. The included HL760 receiver extends usability outdoors and in bright sunlight conditions, giving machine operators and grade checkers a clear, audible and visual grade indication at distance. Whether you're cutting rough grade on a housing pad, setting pipe fall for a sanitary sewer run, or checking fill elevations across a large lot, this package gives you a reliable reference without unnecessary complexity.
Key Specifications
- Model: LL300N-7
- Laser Class: Class II, 635nm red visible laser
- Working Range: Up to 300 meters diameter (with HL760 receiver)
- Self-Leveling Range: ±2 degrees automatic compensation
- Leveling Accuracy: ±1.5mm at 30m (±1/16" at 100 ft)
- Rotation Speed: 150 / 300 / 600 RPM selectable
- Out-of-Level Alarm: Automatic shutdown if tilt exceeds self-leveling range
- Power Supply: 4x AA alkaline batteries
- Battery Life: Up to 100 hours
- IP Rating: IP54 dust and splash resistant
- Operating Temperature: -20°C to +50°C (-4°F to +122°F)
- Tripod Mount: 5/8" x 11 standard thread
What's in the Kit
- Spectra Precision LL300N-7 rotary laser level
- HL760 laser receiver with LED grade indicator and audible alerts
- Receiver mounting bracket and clamp
- Carrying case for secure transport and storage
- 4x AA batteries
- Operator's manual
Job Applications
Rough Grading & Site Prep: Establish a consistent horizontal plane across large cut-and-fill areas. The 300m range keeps a single instrument setup productive across full residential lots and small commercial pads without repositioning.
Utility Trenching & Pipe Laying: Set precise pipe grade and fall for sanitary, storm, and water service runs. The HL760 receiver clips directly to a grade rod so operators can quickly verify invert elevations and slope consistency without a second crew member.
Foundation Layout & Footing Elevation: Confirm form heights and bearing surface elevations during concrete pours. Rotating at 600 RPM, the LL300N-7 provides a continuous reference plane that form setters and concrete finishers can check from any position around the structure.
Drainage & Landscaping Grading: Control positive drainage slopes on residential sites, parking areas, and sports fields. The single-grade format is straightforward for landscape crews to operate without specialized training.
Compatible Accessories
- Spectra Precision HL760 Replacement Receiver
- Spectra Precision HR320 Grade Rod
- Heavy-Duty Laser Tripod (5/8" x 11 Mount)
- Spectra Precision RC601 Remote Control
- Replacement Carrying Case for LL300 Series
Related Guides
- How to Set Up a Rotary Laser Level on a Jobsite
- Single-Grade vs. Dual-Grade Lasers: Which Do You Need?
- Using a Laser Receiver for Machine Control and Grade Checking
- Pipe Laying Grade Setup with a Rotary Laser
Frequently Asked Questions
- Can the LL300N-7 be used outdoors in direct sunlight?
- Yes. While the red laser beam is not visible to the naked eye in bright sunlight, the included HL760 receiver is designed for outdoor use and detects the beam reliably at distances up to 300 meters in typical site conditions. The receiver's LED display and audible beep make it easy to find and hold grade without needing to see the beam directly.
- Does the LL300N-7 support grade or slope settings?
- No. The LL300N-7 is a single-grade, self-leveling instrument that projects a horizontal plane only. It does not support manual slope or dual-grade settings. If your work requires setting a specific percentage slope, consider upgrading to the Spectra Precision LL500 or a comparable grade laser.
- What happens if the laser gets bumped or knocked out of level on the job?
- The LL300N-7 features an automatic out-of-level shutdown. If the instrument is tilted beyond its ±2-degree self-leveling range — due to a tripod bump or unstable setup — the laser will stop rotating and alert the operator. Simply re-level and resume. This prevents crews from unknowingly working off a false plane.
- Is the LL300N-7 compatible with machine control systems?
- The LL300N-7 can be used with grade control receivers mounted on blade masts for basic machine guidance, but it is not a dedicated machine control laser. For high-production dozer or motor grader applications, a purpose-built machine control laser such as the Spectra Precision GL422N is recommended for greater robustness and compatibility.
