The David White SitePRO 27-RD105 is a professional-grade rotary laser detector engineered for contractors who need reliable, fast beam acquisition across a wide range of grading, excavation, and layout applications. With dual front and rear LCD displays, adjustable sensitivity settings, and a heavy-duty magnetic rod clamp, the RD105 is built to keep your crew productive on complex, fast-moving job sites where downtime is not an option.
Overview and Jobsite Applications
Unlike entry-level detectors that struggle in bright sunlight, dense vegetation, or congested multi-crew environments, the RD105 delivers consistent detection in demanding conditions. Whether you are setting grade stakes across a broad commercial pad, fine-grading a residential lot, or coordinating multiple laser setups on a large infrastructure project, the RD105 gives your rod person the immediate visual feedback needed to hit grade quickly and accurately. The detector pairs with virtually any rotary laser on the market, making it a versatile addition to any contractor's instrument kit.
Key Specifications
- Detection Range: Up to 2,000 ft (600 m) diameter under optimal conditions
- Display Type: Dual front and rear LCD screens with directional grade indicators
- Sensitivity Modes: Multiple user-selectable sensitivity settings for fine and coarse work
- Audible Alert: Built-in beeper with variable tone for on-grade and off-grade indication
- Power Source: Standard 9V battery
- Mounting: Heavy-duty magnetic clamp compatible with standard grade rods
- Operating Temperature: -4°F to 122°F (-20°C to 50°C)
- Compatibility: Works with all major brands of rotary laser levels
Key Features
- Dual LCD displays on front and rear panels so both the rod person and the instrument operator can read grade simultaneously
- Adjustable sensitivity controls allow switching between fine-grade precision and coarse detection for rough grading passes
- Strong magnetic clamp secures detector to aluminum or fiberglass grade rods without tools
- Large directional arrows on display provide clear up/down/on-grade guidance even in direct sunlight
- Audible beeper with distinct on-grade tone reduces reliance on visual checking in noisy environments
- Compact, balanced housing minimizes rod sway during windy conditions
- Low battery indicator prevents unexpected field failures mid-task
Job Applications
Commercial Site Grading: Use the high-sensitivity mode to hold tight tolerances across large commercial pads where even minor elevation errors compound over distance. The dual display lets a second crew member verify grade from the instrument station without walking the site.
Residential Foundation and Footing Layout: Switch to fine-sensitivity for footing elevation checks, where fractions of an inch matter for slab flatness and drainage compliance. The audible alert keeps the rod crew heads-up rather than eyes-down in busy excavation zones.
Pipeline and Utility Trenching: Maintain consistent invert elevations in open-cut trenching operations. The magnetic clamp locks quickly to a story pole or pipe laser target rod, and the coarse mode accelerates rough-cut passes before switching to fine for final grade.
Landscape and Drainage Grading: Dial in positive drainage slopes on residential and commercial landscape projects. The RD105 handles partial shade and dappled light conditions that confuse simpler detectors, keeping crews moving without constant repositioning of the laser.
Compatible Accessories
- David White SitePRO Rotary Laser Levels
- Fiberglass Grade Rods and Story Poles
- Aluminum Grade Rods
- Laser Target Plates for Extended Range
- Replacement 9V Batteries and Field Power Kits
Related Guides
- How to Choose the Right Laser Detector for Your Rotary Laser
- Setting Grade Stakes with a Rotary Laser and Detector
- Fine vs. Coarse Sensitivity: When to Switch Modes in the Field
- Rotary Laser Detector Troubleshooting Guide
Frequently Asked Questions
- Is the RD105 compatible with laser levels from other brands besides David White?
- Yes. The SitePRO 27-RD105 is designed to detect the rotating beam of virtually all major-brand rotary laser levels, including those from Spectra, Topcon, Leica, and Bosch, as long as the laser operates in the detector's reception frequency range.
- What is the difference between the fine and coarse sensitivity settings?
- Coarse sensitivity captures the beam over a wider detection window, which is ideal for rough grading passes where speed matters more than precision. Fine sensitivity narrows the detection window so the rod person can zero in on exact grade elevation for finish work, foundations, or utility invert checks.
- Can the RD105 be used outdoors in direct sunlight?
- Yes. The LCD displays and audible alert are specifically designed for outdoor use, including direct sunlight conditions. For extreme distances or very bright environments, pairing the detector with a laser target plate can further extend reliable detection range.
- What battery does the RD105 use and how long does it last?
- The RD105 runs on a single standard 9V battery. Under typical field use, battery life is sufficient for extended workdays. The built-in low battery indicator will alert you before power drops to a level that could affect detection performance.
