# Spectra Precision LR30-DM Machine Display Receiver w/ Mast and NiMH Batteries
## Overview
The Spectra Precision LR30-DM is a complete turnkey grading solution that combines the advanced LR30 machine display receiver with the DM-20 42-inch rigid mast into one ready-to-install system. Designed specifically for contractors running laser-guided dozers and motor graders, this integrated package eliminates the need for custom fabrication or compatibility guesswork. The LR30 receiver features a high-visibility LCD display with real-time elevation readouts, audible alerts, and multiple working modes to accommodate various grading applications. The included DM-20 rigid mast provides stable, accurate positioning of the receiver in the laser plane, while the NiMH battery pack delivers a full day's operation on a single charge. Whether you're working on residential site prep, commercial pad grading, or agricultural land leveling, the LR30-DM delivers the precision and reliability Spectra Precision is known for—just bolt it to your machine and start grading.
## Key Specifications
- **Display Type:** Backlit LCD with numeric elevation readout
- **Detection Range:** 1,600 feet (490 m) diameter working area
- **Accuracy:** ±1/16 inch (1.5 mm) in all modes
- **Mast Height:** 42 inches (107 cm) rigid aluminum construction
- **Power Source:** Rechargeable NiMH battery pack (included)
- **Battery Life:** 60+ hours continuous operation
- **Operating Modes:** Auto, Manual, Scan
- **Grade Display:** On-grade indicator with high/low arrows
- **Audio Alerts:** Multi-tone beeper for elevation guidance
- **Mounting:** Universal blade/bucket bracket (tools included)
- **Durability Rating:** IP67 water and dust protection
- **Operating Temperature:** -4°F to 122°F (-20°C to 50°C)
- **Compatibility:** Works with all Spectra rotating lasers (HV301, GL412N, GL422N, GL612, GL622, etc.)
- **Weight:** 4.2 lbs (1.9 kg) complete system
## What's in the Kit
- LR30 Machine Display Receiver with protective housing
- DM-20 42-inch rigid aluminum mast
- Universal mounting bracket for blade/bucket attachment
- NiMH rechargeable battery pack
- AC battery charger with international adapters
- 12V DC vehicle charging cable
- Complete mounting hardware and bolts
- Operator's manual with quick-start guide
- Protective carrying case
- Spectra Precision 3-year manufacturer warranty
## Job Applications
- **Residential Site Development** – Achieve precise building pad elevations and ensure proper drainage slopes for foundations, driveways, and yard grading without constant grade checking
- **Commercial Earthwork Projects** – Speed up large-scale cut-and-fill operations on parking lots, industrial pads, and retail centers while maintaining tight elevation tolerances across expansive areas
- **Road Construction and Repairs** – Establish accurate sub-base grades for highways, streets, and rural roads, reducing material waste and eliminating low spots that cause premature pavement failure
- **Agricultural Land Leveling** – Create uniform field elevations for optimal irrigation efficiency and crop yields, especially critical for flood irrigation, rice paddies, and precision farming operations
- **Utility Trenching and Pipeline Grades** – Maintain consistent trench depths and slopes for water, sewer, gas, and drainage installations, preventing costly rework from grade errors
- **Sports Field and Golf Course Construction** – Build precisely graded athletic fields, baseball diamonds, and golf course features where surface drainage and playability depend on exact elevations
## Compatible Accessories
- [Spectra Precision Remote Control RC402N](link) – Wireless laser control from the cab
- [GL412N Single Grade Laser Package](link) – Entry-level rotating laser system
- [GL622 Dual Grade Laser with RC602N](link) – Advanced dual-slope capability
- [HL760 Horizontal Laser System](link) – Layout and alignment applications
- [LR60 Wireless Receiver](link) – Upgrade to wireless operation
- [Machine Control Valve Kits](link) – Complete automatic grade control systems
- [Additional Battery Packs](link) – Extended runtime for long shifts
- [Laser Detector Clamps](link) – Alternative mounting solutions
## Related Guides
- [How to Set Up Your LR30-DM Receiver in 5 Minutes](link)
- [Rotating Laser Grade Control Buyer's Guide](link)
- [Maximizing Battery Life on Laser Receivers](link)
- [Understanding Laser Receiver Accuracy and Range](link)
## FAQ
- What's the difference between the LR30-DM and buying the receiver and mast separately?
- The LR30-DM is a factory-matched system that includes the receiver, mast, mounting hardware, and batteries in one package at a lower price than purchasing components individually. It's pre-calibrated and tested as a complete unit, ensuring optimal performance and eliminating compatibility questions. You also receive a single warranty covering the entire system rather than separate warranties for each component.
- Can I use the LR30-DM with my existing Spectra laser transmitter?
- Yes, the LR30-DM receiver is compatible with all Spectra Precision rotating lasers including the HV301, GL412N, GL422N, GL612, GL622, GL712, and GL722 models. It also works with many other manufacturers' rotating lasers that operate on standard frequencies. The receiver automatically detects the laser signal and displays elevation information regardless of which compatible transmitter you're using.
- How long does the NiMH battery last, and can I charge it in my truck?
- The included NiMH battery pack provides 60+ hours of continuous operation under normal conditions. The system includes both an AC wall charger and a 12V DC vehicle adapter, so you can recharge overnight in your shop or during lunch breaks using your truck's power outlet. A full recharge takes approximately 4-6 hours, and we recommend keeping a spare battery pack on hand for multi-day projects in remote locations.
- Is this system accurate enough for finish grading work?
- Absolutely. The LR30-DM delivers ±1/16 inch (1.5 mm) accuracy throughout its entire 1,600-foot diameter working range, which exceeds the requirements for most finish grading applications including building pads, sports fields, and commercial flatwork. The high-resolution display and sensitive detector array allow experienced operators to consistently hold tolerances within ±1/8 inch on final passes. For applications requiring even tighter tolerances, consider upgrading to a full automatic machine control system.
