The Spectra Precision LL300N-CR72 is a complete, job-ready rotary laser package engineered for contractors who need dependable grade control without overpaying for features they won't use on every site. Bundled with the CR700 laser receiver, an inches-graduated leveling rod, and a heavy-duty tripod, this kit eliminates the guesswork of sourcing compatible components and gets your crew working from the moment it arrives on site.
System Overview & Jobsite Applications
The LL300N operates as a single-axis, self-leveling rotary laser that establishes precise horizontal reference planes across open job sites. Its automatic self-leveling mechanism compensates for minor tripod settling and uneven ground, reducing setup time and operator error. With a working radius of up to 2,000 feet in diameter when paired with the included CR700 receiver, the LL300N is well-suited for medium to large grading sites, slab pours, and drainage layout work. The sealed housing and IP66-rated dust and water resistance mean the unit holds up in the mud, dust, and rain typical of active construction environments.
Key Specifications
- Laser Class: Class IIIa red beam (635 nm)
- Self-Leveling Range: ±5°
- Accuracy: ±1/16 in. at 100 ft (±1.5 mm at 30 m)
- Working Diameter: Up to 2,000 ft (600 m) with CR700 receiver
- Rotation Speed: 100, 300, or 600 RPM selectable
- Battery Life: Up to 100 hours (4 x D-cell alkaline)
- Dust & Water Protection: IP66 rated
- Operating Temperature: -4°F to 122°F (-20°C to 50°C)
- Instrument Weight: 4.2 lbs (1.9 kg)
What's in the Kit
- Spectra Precision LL300N rotary laser level
- CR700 laser receiver with mounting bracket and clamp
- Inches-graduated fiberglass leveling rod
- Heavy-duty adjustable tripod
- Rechargeable battery pack or 4 x D-cell battery holder
- Carrying case for instrument and accessories
- Operator's manual and quick-start guide
Job Applications
Site Grading & Earthwork: Set grade elevation for cut-and-fill operations across large pads. The CR700 receiver's audible and visual grade alerts allow a single operator to grade independently without a rod person, improving crew efficiency.
Concrete Flatwork & Slabs: Establish and verify consistent slab thickness and floor elevation during screeding. The LL300N's ±1/16 in. accuracy at 100 ft satisfies ACI flatness tolerances for most commercial and residential flatwork specifications.
Drainage & Utility Layout: Use the remote-controlled slope function to set precise drainage grades for swales, storm sewers, and utility trenches where positive drainage is a design requirement.
Foundation & Footing Layout: Confirm footing depths and bearing elevations across multiple excavated footings simultaneously, eliminating repeated instrument moves and reducing layout time on complex foundation plans.
Compatible Accessories
- Spectra Precision CR700 Replacement Receiver
- Spectra Precision HL760 Laserometer Hand-Held Receiver
- Spectra Precision RC703 Remote Control
- Replacement D-Cell Battery Holder for LL300N
- Spectra Precision Grade Rod Clamp & Bracket Accessories
Related Guides
- How to Set Up a Rotary Laser Level on a Construction Site
- LL300N vs. LL500: Choosing the Right Grade Laser for Your Project
- Using a Laser Receiver for Single-Operator Grading
- Rotary Laser Level Maintenance & Calibration Guide
Frequently Asked Questions
- Does the LL300N-CR72 package include everything needed to start grading immediately?
- Yes. The kit includes the LL300N laser, CR700 receiver, inches-graduated leveling rod, and tripod. You will need D-cell batteries or a compatible rechargeable pack if one is not included in your specific configuration. No additional equipment purchases are required to begin horizontal grade work on day one.
- Can the LL300N be used for slope or grade applications?
- The LL300N is primarily designed for horizontal (level) applications. It does not natively project a sloped plane. For single or dual-axis grade applications, Spectra Precision offers the LL500 series. The LL300N is best suited for level reference work such as flatwork, footing layout, and site grading to a flat datum.
- What is the battery life, and what batteries does the LL300N use?
- The LL300N delivers up to 100 hours of runtime on four standard D-cell alkaline batteries, making it one of the most economical instruments to operate in its class. An optional rechargeable battery pack is available separately for crews who prefer to eliminate recurring alkaline costs on long-duration projects.
- Is the LL300N durable enough for outdoor use in wet or dusty conditions?
- Yes. The LL300N carries an IP66 ingress protection rating, meaning it is sealed against powerful water jets and heavy dust intrusion. It is rated for operation in temperatures from -4°F to 122°F, making it suitable for year-round use across most North American climates. The instrument is built to Spectra Precision's contractor-grade durability standards for active job site environments.
