Spectra Precision HR320 Laser Receiver / Laser Detector

Overview

The Spectra Precision HR320 Laser Receiver is a professional-grade laser detector engineered for construction crews who demand reliable elevation control in challenging field conditions. Grading contractors, concrete finishers, excavation operators, and site preparation teams use the HR320 to capture rotating laser signals with precision accuracy, even in bright sunlight where visual grade checking becomes impossible. This receiver mounts on grade rods, excavator masts, or machine control systems to provide continuous elevation feedback during earthwork, foundation pours, drainage installation, and finish grading operations. Built to withstand the impacts, vibration, dust, and moisture exposure of active jobsites, the HR320 delivers consistent performance across residential, commercial, and infrastructure projects where elevation accuracy directly affects project timelines and material costs.

Key Specifications

• Detection Range: Up to 1,200 ft (365 m) diameter working radius with compatible rotating lasers
• Accuracy: ±1/16 in. (±2 mm) digital readout precision
• Laser Compatibility: Detects all rotating red beam lasers (dual slope, single slope, and horizontal)
• Detection Window: 80 mm front-facing sensor capture area
• Visual Indicators: Multi-segment LCD display with on-grade, high, and low indicators
• Audio Alerts: Variable-pitch tone increases in frequency as receiver approaches grade elevation
• Mounting Options: Universal clamp fits grade rods from 1.1 to 1.6 in. diameter; accepts machine control brackets
• Power Source: Two AA alkaline batteries (included)
• Battery Life: 60+ hours continuous operation under normal conditions
• Operating Temperature: 14°F to 122°F (-10°C to 50°C)
• Weatherproofing: IP67 rating—sealed against dust intrusion and water immersion up to 1 meter
• Dimensions: 5.5 in. H × 3.2 in. W × 1.4 in. D
• Weight: 0.6 lb (270 g) with batteries installed

What's in the Kit

• Spectra Precision HR320 Laser Receiver
• Universal rod clamp with thumbscrew tightening mechanism
• Two AA alkaline batteries (installed)
• Protective hard-shell storage case
• Quick-start instruction guide
• One-year manufacturer warranty card

Job Applications

• Excavation and Rough Grading: Operators check cut/fill elevations on grade rods to control earth removal and placement without waiting for instrument readings, keeping scrapers, dozers, and loaders productive throughout the day.
• Concrete Slab and Foundation Pours: Finishers verify deck elevation continuously during screeding operations, ensuring thickness uniformity and eliminating costly callbacks from improper slope or out-of-level placements.
• Drainage and Utility Trenching: Crews establish accurate invert elevations for storm systems, sanitary sewers, and utility conduits where gravity flow depends on precise slope control over extended runs.
• Parking Lot and Roadway Construction: Paving teams maintain proper cross-slope and longitudinal grade during base preparation and asphalt placement, preventing ponding issues and drainage failures.
• Agricultural Land Leveling: Grading contractors achieve uniform field elevations for flood irrigation systems and water management, maximizing coverage efficiency and crop yield potential.
• Building Pad and Site Preparation: Site crews establish finish grade elevations for building pads, sidewalks, and landscaped areas without constant total station setups, reducing layout time and instrument costs.

Compatible Accessories

Expand system capability with these Spectra Precision components designed for integrated laser level workflows:

• Spectra Precision LL300N Laser Level — Self-leveling rotating laser with 1,000 ft working diameter
• Spectra Precision LL500 Laser Level — Dual-grade rotating laser for complex slope applications
• Spectra Precision HL760 Digital Laser Level — Horizontal/vertical rotating laser with remote control
• 25-Foot Aluminum Grade Rod — Telescoping rod with direct-reading graduations
• Heavy-Duty Grade Rod Tripod — Stable receiver positioning for one-person operation
• CR600 Machine Control Receiver — Upgrade to dual-sensor machine mounting system

Related Guides

• How to Use a Laser Receiver for Site Grading and Excavation
• Laser Receiver Comparison Chart: Accuracy, Range, and Feature Differences
• Setting Up Rotating Lasers for Single and Dual-Slope Applications
• Troubleshooting: Laser Receiver Not Picking Up Signal

Frequently Asked Questions

Will the HR320 work with laser levels from other manufacturers?

Yes. The HR320 detects any rotating red beam laser regardless of brand, including Topcon, Leica, CST/Berger, Johnson, and DeWalt models. The universal design ensures compatibility across mixed equipment fleets, though advanced features like remote control only function with Spectra transmitters.

How do I know when the receiver is exactly on grade elevation?

The HR320 provides both visual and audio feedback. The center LCD segment illuminates when the detection window crosses the laser plane, while the audio tone switches to a continuous beep. Arrows on the display indicate which direction to move (up or down) when off-grade, with pitch increasing as you approach the correct elevation.

Can this receiver be used for vertical alignment or just horizontal grade work?

The HR320 is designed specifically for horizontal rotating laser detection and grade control applications. For vertical alignment, plumb checking, or layout tasks requiring a rotating laser in vertical orientation, you'll need a dual-display receiver like the Spectra Precision CR600 that reads both horizontal and vertical laser planes.

What's the functional difference between detection range and accuracy specifications?

Detection range (1,200 ft diameter) indicates the maximum distance at which the receiver can sense the laser signal under ideal conditions—this determines your working area size. Accuracy (±1/16 in.) refers to the precision of the elevation reading once detected—this determines how close to true grade your finished work will be. Both specifications matter, but accuracy directly affects final tolerances on concrete and grading work.