SitePro 27-LR422GR Dual Grade Rotary Laser
The SitePro 27-LR422GR is a professional-grade dual grade rotary laser designed for contractors who need precise, repeatable slope control across complex jobsite layouts. With independent dial-in grade settings on two axes simultaneously, this self-leveling laser system eliminates the need to reposition equipment between grading zones — saving crews time and reducing the margin for error on projects with varied finish grade requirements. Whether you're managing drainage slopes on a commercial pad, setting subgrade for a parking structure, or grading a multi-zone residential site, the 27-LR422GR delivers the accuracy and workflow efficiency that professional grading crews demand.
Jobsite Overview & Applications
The 27-LR422GR is engineered for the full range of outdoor grading and excavation tasks where single-axis lasers fall short. Its dual grade capability means a single instrument setup can govern slopes running in two directions at once — critical for applications like cross-slope road grading, drainage swales, ADA-compliant flatwork, and retention basin construction. The self-leveling mechanism brings the instrument to working grade quickly after setup, and the manual grade mode lets operators dial in custom slopes for specialized finish work. With a long-range receiver compatibility and rugged, jobsite-hardened housing, this laser keeps pace with fast-moving earthwork operations.
Key Specifications
- Grade Range: ±10% on both X and Y axes simultaneously
- Grade Accuracy: ±0.1% (dial-in resolution)
- Self-Leveling Range: ±5°
- Operating Range: Up to 2,000 ft diameter (with compatible receiver)
- Rotation Speed: Selectable — 150, 300, 600 RPM
- Dual Grade Mode: Independent slope dial-in on X and Y axes
- Laser Class: Class IIIa / 3R, 635nm red beam
- IP Rating: IP66 — dust-tight and protected against heavy water ingress
- Battery Life: Up to 40 hours (alkaline D-cell batteries)
- Operating Temperature: -20°C to +50°C (-4°F to +122°F)
- Tripod Mount: 5/8-11 thread compatible
- Weight: Approximately 5.5 lbs (instrument only)
Key Features
- Dual Axis Dial-In Grade: Set and lock two independent slopes simultaneously for coordinated multi-zone grading without repositioning the instrument
- Self-Leveling Operation: Automatic leveling gets the instrument to grade quickly; manual override available for custom slope work
- Long Operating Range: Compatible with standard and extended-range receivers for large site coverage up to 2,000 ft diameter
- Selectable Rotation Speed: Three RPM settings allow operators to balance beam visibility with scanning speed for different ambient light conditions
- Out-of-Level Alarm: Audible and visual alert if the instrument is bumped or disturbed during operation
- Remote Control Ready: Compatible with SitePro wireless remote for grade adjustments without leaving the machine cab
- Rugged IP66 Housing: Built to withstand dust, mud, and rain exposure on active grading sites
- Extended Battery Life: Up to 40 hours of runtime on standard D-cell batteries reduces downtime on long production days
Job Applications
Commercial Site Grading: On large commercial pads where drainage must flow in two directions, the dual grade dial-in lets operators set cross-slopes and longitudinal slopes from a single instrument position, keeping the grade crew and machine operators working from consistent control points throughout the project.
Parking Lot & Flatwork: ADA and drainage requirements often demand precise bi-directional slopes on flatwork. The 27-LR422GR's dual axis control and high dial-in accuracy make it a reliable tool for concrete and asphalt flatwork contractors who need to hit tight grade tolerances across large paved areas.
Road & Highway Subgrade: Road construction crews benefit from the ability to set both the longitudinal profile slope and the cross-slope simultaneously, allowing motor graders and compactors to work to laser control without stopping to reconfigure the instrument at each transition.
Retention Basins & Drainage Swales: Earthwork contractors shaping detention ponds, retention basins, and drainage channels rely on precise slope control at the bottom of excavations. The 27-LR422GR's wide grade range and accurate dial-in settings make it well-suited for establishing consistent slopes in below-grade drainage infrastructure.
Compatible Accessories
- Compatible Laser Receivers — Standard and extended-range rod-mounted receivers for machine and hand-grade work
- SitePro Wireless Remote Control — Adjust grade settings from the machine cab without walking to the instrument
- Heavy-Duty Tripods & Grade Rod Mounts — Stable setups for demanding grading environments
- Detector Clamps & Rod Brackets — Secure receiver mounting for grade rods and machine masts
- Hard-Shell Instrument Cases — Protective transport and storage for the 27-LR422GR system
Related Guides
- How to Set Up a Dual Grade Rotary Laser on a Grading Project
- Rotary Laser vs. Pipe Laser: Choosing the Right Tool for the Job
- Machine Control vs. Grade Laser: When Each Approach Makes Sense
- How to Choose the Right Laser Receiver for Your Rotary Laser
Frequently Asked Questions
- Can the SitePro 27-LR422GR set different slopes on both axes at the same time?
- Yes. The 27-LR422GR features true dual grade capability, allowing operators to independently dial in and lock a slope on both the X and Y axes simultaneously. This means you can set a longitudinal slope in one direction and a cross-slope in the perpendicular direction without repositioning the instrument or making sequential adjustments — a critical feature for drainage grading, road construction, and complex flatwork.
- What is the maximum grade range of the 27-LR422GR?
- The 27-LR422GR supports grade settings from 0% to ±10% on both axes. This covers the vast majority of civil grading applications, from very slight ADA-compliant flatwork slopes to steeper drainage swales and embankment faces. For slopes beyond 10%, a different instrument or manual benchmarking method would be required.
- Does this laser work with a machine control receiver or only hand-grade receivers?
- The 27-LR422GR is compatible with standard laser receivers that can be mounted on grade rods for hand-grade work as well as mast-mounted receivers used on dozers, motor graders, and scrapers for machine-guided grading. Refer to the compatible accessories section or contact Express Tools to confirm receiver compatibility with your specific machine control setup.
- How long does the battery last, and what batteries does it use?
- The SitePro 27-LR422GR runs on standard D-cell alkaline batteries and delivers up to approximately 40 hours of continuous operation per set. This makes it practical for full production days on active grading sites without frequent battery changes. Rechargeable D-cell battery packs may also be compatible — contact Express Tools for recommendations.
