Spectra Precision GL412N-2 Single Slope Grade Laser
The Spectra Precision GL412N-2 is a professional-grade single slope rotary laser built for contractors who need reliable, accurate grade control on everyday earthmoving, paving, and flatwork jobs. Paired with the CR700 machine-control receiver and an inches-graduated grade rod, this kit gives grading crews everything they need to establish consistent slope right out of the box. If your work involves parking lots, drainage channels, concrete slabs, or site prep where one controlled slope is the daily requirement, the GL412N-2 delivers the precision and durability to keep production moving without constant setups or callbacks.
Jobsite Overview
Single slope grade lasers are the workhorses of grading and concrete flatwork operations. Unlike dual-slope systems, the GL412N-2 is purpose-built for applications where slope runs in one direction — keeping setup straightforward and operation fast. The instrument self-levels within its working range and begins rotating immediately, so crews spend less time on instrument setup and more time on grade. The red beam laser is picked up reliably by the CR700 receiver across large open sites, giving operators grade indication from the machine cab or on the rod at distances where unaided eye detection is impossible.
Key Specifications
- Laser Type: Red beam rotary laser
- Grade Range (Single Slope): 0% to 25% (0° to 14.2°)
- Self-Leveling Range: ±5°
- Accuracy: ±1.5mm at 30m (±1/16 in. at 100 ft.)
- Operating Range: Up to 800m (2,600 ft.) diameter with CR700 receiver
- Rotation Speed: Selectable — 150, 300, or 600 RPM
- Beam Plane: Horizontal and vertical
- Power Source: Internal rechargeable battery pack
- Battery Life: Up to 30 hours typical
- IP Rating: IP55 — dust and water jet resistant
- Operating Temperature: -20°C to +50°C (-4°F to 122°F)
- Weight: Approx. 2.0 kg (4.4 lbs.) instrument only
What's in the Kit
- Spectra Precision GL412N-2 single slope rotary laser instrument
- CR700 laser receiver with clamp
- Inches-graduated grade rod (standard range)
- Rechargeable battery pack and charger
- Carrying case for instrument and accessories
- Operator's manual and quick-start guide
Key Features
- Single Slope Grade Setting: Dial in slope from 0% to 25% for straightforward one-direction grading without the complexity of dual-axis setup
- Horizontal and Vertical Beam: Rotate the head to vertical orientation for layout, alignment, and plumb work on the same instrument
- CR700 Receiver: High-visibility receiver with audible and visual grade indication — works reliably in bright outdoor conditions at distances far beyond naked-eye detection
- Selectable Rotation Speed: Adjust RPM to balance beam visibility with sweep rate for different applications and distances
- Rugged IP55 Housing: Sealed against jobsite dust and water spray — built to handle real contractor environments, not just shop demos
- Long Battery Life: Up to 30 hours of runtime keeps the instrument in the field through full shifts without mid-day charging interruptions
- Self-Leveling with Out-of-Level Alert: Instrument automatically levels within range and shuts down the beam if knocked out of level, preventing costly grading errors
Job Applications
The GL412N-2 is suited to a focused range of high-value grading and concrete applications:
- Parking Lot Construction and Repaving: Establish and maintain consistent cross-slope or longitudinal slope across large paved surfaces. The CR700 receiver and long working range keep the grade rod or screed operator on grade across the full lot without moving the instrument.
- Concrete Flatwork and Slabs: Control slab pour depth and slope for drainage-critical pads such as warehouse floors, equipment pads, and loading docks. The accuracy spec supports ACI flatness requirements on standard commercial pours.
- Drainage Swales and Channels: Set and hold consistent channel slope for surface drainage features. Single slope operation is a direct match to this application type — no dual-axis complexity needed.
- Site Prep and Rough Grading: Use the CR700 on a grade rod to check cut and fill during dozer or motor grader work before fine grading. The 800m working diameter covers most single-machine production areas from one instrument setup.
Compatible Accessories
- Spectra CR700 Laser Receiver — replacement or additional receiver for two-man crew operation
- Spectra Rechargeable Battery Pack — spare battery for extended shift coverage
- Inches-Graduated Grade Rod — replacement or extended-range rod
- Heavy-Duty Laser Tripod — stable instrument mount for uneven terrain setups
- GL400 Series Replacement Carrying Case — additional protection for transport
Related Guides
- How to Set Grade with a Rotary Laser — Step-by-Step Contractor Guide
- Single Slope vs. Dual Slope Grade Lasers — Which Do You Need?
- Using a Laser Receiver on the Jobsite — CR700 Setup and Tips
- How to Check and Verify Grade Laser Calibration in the Field
Frequently Asked Questions
- Can the GL412N-2 be used for dual slope applications?
- No. The GL412N-2 is a single slope laser and controls grade in one axis only. If your project requires simultaneous slope in two directions — such as a crowned road or a complex drainage basin — you would need a dual slope instrument like the Spectra GL422N. For parking lots, swales, standard slabs, and most site prep work, single slope is sufficient and keeps setup simpler.
- What is the maximum working range of the CR700 receiver?
- The CR700 receiver has a working range of up to 800 meters (approximately 2,600 feet) in diameter when used with the GL412N-2. In bright sunlight, the red beam will not be visible to the naked eye at production distances, but the CR700 detects and locks onto the beam reliably across that full working range, giving audible and visual on-grade indication to the rod operator or machine mount.
- Does the GL412N-2 work for vertical alignment tasks?
- Yes. The instrument head can be rotated to project a vertical beam plane, which is useful for alignment, layout, and plumb reference tasks. This makes the GL412N-2 a more versatile tool than a dedicated grade-only laser, allowing the same instrument to handle layout work on the same jobsite without a second instrument.
- How long does the battery last and can I use external power?
- The GL412N-2 runs up to approximately 30 hours on a full charge with the included rechargeable battery pack, which covers most full-day and into overnight jobsite scenarios. A spare battery pack is available if your operation runs multiple shifts. The instrument can also typically be operated on external 12V power, making it compatible with vehicle power outlets for extended machine-mounted or stationary use — consult the operator's manual for external power connection details.
