Spectra Precision LR50 Machine Control Receiver

The Spectra Precision LR50 is a heavy-duty, machine-mounted laser receiver built for accurate elevation control in grading, excavation, and trenching applications. Designed for use on dozers, box blades, scrapers, and excavators, the LR50 provides fast and reliable grade feedback directly to the operator via a bright 5-channel LED display.

With a 360° laser detection and a wide vertical reception window of 171 mm (6.75 inches), the LR50 ensures rapid and consistent beam acquisition from any direction. It supports manual display operation or automatic machine control, integrating seamlessly with Spectra CB-series control boxes (CB20, CB25, CB30). Operators can choose from multiple on-grade deadband settings, including ultra-fine (5 mm), standard (10 mm), and wide (20 mm), as well as offset grading modes (up to 50 mm) for excavation workflows.

The LR50 also includes blade tilt and plumb indication, providing real-time side-to-side and front-to-back angle feedback. Beam averaging, slope matching, and out-of-beam indication are built-in to reduce signal fluctuations and improve grade accuracy, even in windy or long-range conditions. Built with a cast aluminum housing and polycarbonate casing, the LR50 is IP67-rated and drop-tested from up to 3 meters (10 feet), making it ideal for rugged jobsite environments.

Key Features

• 360° laser reception with 171 mm vertical capture height

• Bright 5-channel LED grade display for fast cut/fill guidance

• Multiple deadband accuracy options: Fine (5 mm), Standard (10 mm), Wide (20 mm)

• Excavation mode with offset on-grade detection: 12 mm to 50 mm

• Blade-tilt and plumb indication for better grading accuracy

• Beam averaging for stability in turbulent beam conditions

• Slope matching and plumb alignment functions

• Waterproof and dustproof (IP67), drop-rated to 3 m (10 ft)

• Supports auto machine control with Spectra CB20/CB25/CB30

• Power options: 4 x C-cell alkaline, NiMH rechargeable, or 10–30V machine power

• Battery life:

  • Alkaline: up to 60 hrs (dim), 45 hrs (bright)

  • NiMH: up to 45 hrs (dim), 30 hrs (bright)

What’s Included:

LR50 Rechargeable Package

• LR50 Machine Receiver with Linear LED Display

• Built-in Plumb Indicator

• NiMH Rechargeable Battery Pack

• Battery Charger

• Hard Carrying Case

LR50-1 Alkaline Package

• LR50 Machine Receiver with Linear LED Display

• Built-in Plumb Indicator

• Alkaline Battery Compartment (4 x C-cell, batteries not included)

• Hard Carrying Case

LR50W Wireless & Rechargeable Package

• LR50W Wireless Machine Receiver

• RD20 Remote In-Cab Display

• NiMH Rechargeable Battery Pack

• Battery Charger

• Hard Carrying Case

The LR50 is the ultimate solution for contractors who require rugged reliability, flexible mounting, and precision grade control, whether used standalone or in a full machine control system.