Spectra Precision UL633N-1 Universal Laser with HL760 Laserometer Receiver

The SitePRO 27-RD302 Digital Readout Laser Detector gives grading crews, concrete finishers, and machine operators the precision elevation feedback they need to stay on grade without second-guessing coarse beep signals. Unlike basic audio-only receivers, the RD302 pairs a large 5-inch capture window with a backlit digital display that shows exact millimeter or inch deviation from grade — so your crew knows not just that they're off, but how far off and in which direction. Whether you're running a rod by hand or mounting the detector to a blade or screed rail, the RD302 integrates cleanly into active work cycles and holds up to the abuse of a real jobsite.

Overview & Jobsite Applications

The RD302 is engineered for use with standard rotary lasers in horizontal, vertical, and slope applications. Its extended 5-inch capture height means you spend less time hunting for the beam on a rod, and more time confirming elevation and moving dirt. The digital readout eliminates interpretation errors in noisy environments where audible beeps are easy to miss or misread. From subgrade prep and slab pours to pipe trench grading and finish grading passes, the RD302 delivers quantified elevation data exactly when and where it matters most.

Key Specifications

• Model: SitePRO 27-RD302
• Capture Window Height: 5 inches (127 mm)
• Display: Backlit digital readout with directional arrows and deviation value
• Accuracy: ±1/16 inch (±1.5 mm) at the detector face
• Operating Range: Up to 2,000 ft diameter (outdoor, favorable conditions)
• Compatible Laser Types: Rotary lasers operating in standard detection mode
• Power: 2x AA batteries
• Battery Life: Up to 80 hours continuous use
• IP Rating: Water and dust resistant for outdoor jobsite use
• Mounting: Standard 5/8-inch rod clamp included

Key Features

• Digital Deviation Display: Shows exact distance above or below grade — eliminates guesswork from audible-only receivers
• 5-Inch Capture Window: Wide detection zone speeds up rod work and reduces re-centering time on machine mounts
• Directional Arrows: Instant visual up/down indication even when the numeric display isn't readable at a distance
• Adjustable Sensitivity: Fine and coarse detection modes for precision finish work or fast rough grading passes
• Audible Alarm: Backup beep alert for operators working at distance from the display
• Backlit Display: Readable in direct sunlight and low-light conditions without switching modes
• Rugged Housing: Impact-resistant casing built for rod drops and jobsite handling
• Long Battery Life: Up to 80 hours on standard AA batteries — survives a full work week without a swap

Job Applications

Subgrade & Finish Grading: Mount the RD302 to a grade rod and walk cuts and fills with the exact deviation displayed at eye level. No more counting beeps or estimating how far you are from grade — the number tells you.

Concrete Flatwork & Screeding: Clip the detector to a screed rail bracket and let finishers reference the digital display to maintain consistent slab thickness and slope across large pours.

Machine Control Reference: When running a motor grader or skid steer blade manually, a mast-mounted RD302 gives the operator a real-time numeric deviation reference to dial in blade height without stopping for manual checks.

Utility & Pipe Trench Grading: Use the RD302 on a leveling rod in the trench to confirm invert elevations and maintain consistent pipe grade between survey shots.

Compatible Accessories

• Rod Clamp & Bracket Set for Laser Detectors
• Machine Mast Mount Kit — Universal Detector Bracket
• SitePRO Rotary Laser Levels — Compatible Transmitters
• Replacement AA Battery 4-Pack (Contractor Grade)
• Grade Rod with Detector Clamp Slot

Related Guides

• How to Use a Laser Detector for Grading: Setup & Tips
• Rotary Laser vs. Laser Detector: Understanding the System
• Digital Readout vs. Audio-Only Receivers: Which Do You Need?
• Machine Mounting a Laser Detector: Step-by-Step Guide

Frequently Asked Questions

Will the SitePRO 27-RD302 work with any rotary laser, or only SitePRO lasers?

The RD302 is compatible with most standard rotary lasers that operate on a detectable frequency, including units from other manufacturers. It is not limited to SitePRO transmitters. Check your rotary laser's specifications to confirm it supports an external detector — most professional-grade rotary lasers do.

What does the digital readout actually show on the display?

The display shows the numeric deviation from the laser beam centerline, along with directional arrows indicating whether the rod or machine is above or below grade. This lets operators make precise cut or fill decisions without interpreting beep patterns or signal brightness.

Can the RD302 be used on a machine mast or blade bracket?

Yes. The RD302 includes a standard 5/8-inch rod clamp and is compatible with common machine mast and blade mounting brackets. The 5-inch capture window is particularly useful in machine applications where the detector may shift relative to the beam during passes.

How long do batteries last in the field?

SitePRO rates the RD302 at up to 80 hours of continuous use on two standard AA batteries. Under typical field use — powered on during active work, off during breaks — most crews get through a full work week or more before needing a swap.