How does the laser plummet improve setup speed compared to a traditional optical plummet or plumb bob?

The laser plummet projects a visible vertical line to the ground instantly when powered on, allowing crews to center the instrument over a benchmark or corner by adjusting the tripod position until the laser spot aligns with the mark—typically a 30-second operation. Traditional optical plummets or plumb bobs require looking through an eyepiece or waiting for the bob to stop swinging, processes that take considerably longer, especially on windy job sites or when multiple points require centering.

Can the LT8-300LP perform both level and transit measurements without changing instruments?

Yes. The LT8-300LP is a universal level-transit, meaning a single instrument setup handles both elevation measurements (level function) and horizontal angle work (transit function). This capability reduces the need to relocate instruments or bring multiple tools to a setup position, improving crew productivity on jobs requiring mixed measurement types.

What happens if the laser plummet battery dies during a job?

The instrument reverts to traditional optical plumbing methods—you can still use the level and transit optical functions, but you lose the speed advantage of the laser plummet. Experienced crews carry spare batteries and perform laser system checks at job start to prevent mid-day power loss on critical measurements.

Is the laser plummet visible in bright sunlight, and how do you improve visibility?

The laser spot can be difficult to see in direct sunlight on reflective surfaces. Using a laser targeting card—a matte or slightly contrasting target placed at the plumb point—significantly improves laser spot visibility in bright conditions. Many contractors keep a targeting card in their survey kit specifically for sunny job sites.

Does the LT8-300LP require calibration, and how often?

Yes, the laser plummet and optical systems benefit from calibration checks at job start to verify vertical alignment accuracy and confirm that the laser and optical plumbing agree on the vertical line. If the instrument has been transported, exposed to significant temperature swings, or sits in a vehicle between jobs, a quick calibration check takes a few minutes and prevents measurement errors on high-stakes work.

What tripod and accessories do I need to use the LT8-300LP effectively?

You'll need a standard surveying tripod rated for the instrument weight, quality leveling rods and targets for measurement work, and a laser targeting card for improved visibility in sunlight. Many contractors also carry tripod-mounted laser shields to block ambient light and enhance laser spot visibility on bright days.

Spectra Precision GL1425C-27 Dual Grade Laser Package, Bluetooth w/ HL760 Rod Mounted Deluxe Receiver, Tripod and Rod INCHES

← Drag to rotate →

Ships same day on in-stock orders before 2 PM CT

Authorized dealer · genuine, factory-fresh equipment

Compatibility & setup details on every product page

At a Glance

Knowledge Summary: The David White LT8-300LP Universal Level-Transit features integrated laser plummet technology for precision vertical alignment without traditional plumb bobs. Designed for surveyors and contractors requiring both elevation and angle measurements, it combines optical capabilities with modern laser technology. The laser plummet enables rapid setup over survey points, benchmarks, and reference corners, significantly reducing on-site time. Ideal for establishing accurate baselines, control points, and supporting all subsequent surveying work. Civil engineers, construction layout specialists, and land surveyors rely on this instrument for projects demanding both traditional optical precision and modern laser-assisted efficiency.
Instrument Type: Universal Level-Transit with Laser Plummet
Laser Plummet: Integrated laser plummet for vertical alignment
Functions: Level, Transit, and Vertical Alignment
Model: LT8-300LP
Key Feature 1: Integrated laser plummet for vertical centering

Spectra PrecisionGL1425C-27SKU 46-D8872New

Grade Lasers →

Spectra Precision GL1425C-27 Dual Grade Laser Package, Bluetooth w/ HL760 Rod Mounted Deluxe Receiver, Tripod and Rod INCHES

$2830.00

Need 5+? Request volume pricing →

In Stock·Ships same day before 2 PM CT

Qty:

±10% on both X and Y axes simultaneously Range

Cover large layout jobs with a ±10% on both X and Y axes simultaneously working reach.

±1/16 in at 100 ft (1.5 mm at 30 m) Accuracy

Hold grade with a ±1/16 in at 100 ft (1.5 mm at 30 m) accuracy rating.

Power

Runs on Internal rechargeable battery; up to 30 hours runtime for jobsite flexibility.

Authorized Spectra Precision Dealer

Genuine, factory-fresh Spectra Precision equipment with legitimate firmware and calibration documentation.

Ask the AI Assistant

Stock, compatibility, and ordering questions answered instantly

Authorized dealerGenuine, factory-fresh Spectra Precision equipment

Same-day shippingOrders before 2 PM CT ship today

30-day returnsUnused equipment in original packaging

Continuous grade control, no stakes

Eliminates grade staking between passes. One operator on the machine vs. 2-3-person conventional crew.

Authorized Dealer

Genuine equipment sourced straight from manufacturer partners.

Ships Same Day

Orders placed before 2 PM CT leave the dock today.

Genuine Gear

Factory-fresh, authentic units with legitimate firmware.

Best-Price Guarantee

Authorized-dealer pricing on every unit — request a quote anytime.

Kit Builder

Not sure what goes with this grade laser?

Answer a few job questions and our Kit Builder assembles the full setup — receiver, rod, tripod, and case matched to your workflow.

Build your kit

Quick Answer

What is the Spectra Precision GL1425C-27?

The Spectra Precision GL1425C-27 Dual Grade Laser Package, Bluetooth w/ HL760 Rod Mounted Deluxe Receiver, Tripod and Rod INCHES is a Spectra Precision Grade Laser with ±1/16 in at 100 ft (1.5 mm at 30 m) accuracy, ±10% on both X and Y axes simultaneously grade range, and ±5° self-leveling range. It's available from Express Tools as an authorized Spectra Precision dealer with same-day shipping on in-stock orders.

FIELD APPLICATIONS

What contractors use this grade lasers for

Building Foundation Layout and Floor Verification

Construction layout crews use the LT8-300LP to establish building corners over control points and verify floor elevations during foundation work and structural setting. The laser plummet centers over corner marks instantly, and the level function confirms floor heights to specification without multiple instrument setups.

Grading and Drainage Grade Establishment

Grading contractors rely on the LT8-300LP to establish and verify grades across projects where elevation control determines drainage performance and site functionality. The universal transit capability allows angle and elevation work from a single setup, accelerating the measurement and staking process.

Property Boundary and Corner Verification

Land surveyors and civil engineers use the laser plummet to quickly center over property corners and benchmarks, then perform angle and elevation measurements to verify boundary accuracy. The ability to plumb without traditional plumb bobs significantly reduces corner setup time on projects where multiple corners require verification.

Construction Staking on Uneven Terrain

On hillside or sloped sites where traditional plumbing becomes impractical, the LT8-300LP's laser plummet provides reliable vertical alignment regardless of ground conditions. Crews can stake building positions, utility centerlines, and reference points consistently on terrain where optical plummets would be slow or difficult to use.

Topographic Survey and Reference Point Establishment

Surveyors conducting topographic or site surveys use the LT8-300LP to quickly establish and center over benchmark locations, then measure elevation and angle data to surrounding features. The laser plummet ensures precise vertical centering over small or elevated benchmarks that would be time-consuming with traditional methods.

PRODUCT OVERVIEW

Product Description

The Spectra GL1425C-27 is a professional-grade dual-slope laser system engineered for contractors and site superintendents who demand precision, speed, and reliability on demanding civil and building construction jobsites. This complete inch-based package pairs the GL1425C laser with the HL760 deluxe receiver, a heavy-duty tripod, and an inch-graduated grade rod — everything your crew needs to establish and verify grade from the first setup to final inspection.

System Overview & Jobsite Applications

The GL1425C broadcasts a high-visibility laser plane that self-levels within its compensator range and accepts independent dual-axis grade input up to ±10% on both the X and Y axes simultaneously. Bluetooth wireless connectivity allows the instrument operator or grade checker to adjust slope settings remotely from up to 200 feet away using the RC602 remote, reducing crew requirements and keeping workers out of traffic-exposed instrument zones. The inch-graduated rod in this 27-series package is purpose-built for U.S. standard construction workflows, aligning directly with Imperial-unit site plans and eliminating on-the-fly unit conversions during field note documentation. Whether you are grading a parking structure deck, establishing finished floor elevation for a tilt-up building, or setting slope on a storm drain swale, the GL1425C-27 delivers the accuracy and workflow efficiency that professional crews expect.

Key Specifications

Accuracy: ±1/16 in at 100 ft (1.5 mm at 30 m)
Grade Range: ±10% on both X and Y axes simultaneously
Self-Leveling Range: ±5°
Operating Range: Up to 2,000 ft diameter (600 m) with HL760 receiver
Rotation Speed: 100, 300, and 600 RPM selectable
Wireless Control: Bluetooth RC602 remote compatible (up to 200 ft range)
Power: Internal rechargeable battery; up to 30 hours runtime
IP Rating: Weather-resistant construction for outdoor jobsite use
Rod Graduation: Inch-based (27-series)

What's in the Kit

GL1425C Dual-Grade Rotating Laser — the core instrument with onboard grade drive and Bluetooth module
HL760 Deluxe Laser Receiver — large 5-inch detection window, audible and visual grade indicators, magnetic bracket for rod mounting
Heavy-Duty Tripod — aluminum construction, wide stance base for stable setup on soft or uneven ground
Inch-Graduated Grade Rod — U.S. standard Imperial graduation for direct read-out with American site plans
Rechargeable Battery Pack & Charger
Carrying Case — hard-shell instrument case for transport and storage

Job Applications

Parking Lot & Parking Structure Grading: Set precise cross-slopes and drainage grades across large paved areas. The dual-grade capability lets you program both longitudinal and transverse slopes in a single setup, reducing instrument moves and keeping paving crews productive.

Building Pad & Finished Floor Elevation: Establish and verify subgrade and finished floor elevations for tilt-up, masonry, and wood-frame construction. The HL760 receiver gives finish carpenters and concrete crews a fast, audible-confirmation grade check without calling the instrument operator.

Utility & Storm Drain Installation: Control pipe invert elevations and trench bottom grades for gravity-flow systems. The extended 2,000 ft operating range keeps the laser out of the active excavation zone while maintaining consistent grade reference throughout the run.

Road Base & Site Earthwork: Use the GL1425C-27 with a machine-mount receiver bracket to guide motor graders and compactors during rough and finish grading operations, reducing pass counts and improving compaction uniformity across the pad.

Compatible Accessories

RC602 Bluetooth Remote Control — adjust grade and rotation speed from the rod location
HL760 Replacement Receiver — spare receiver for large crews or multi-machine operations
Spectra Grade Rod Extensions — extend reach for deep excavation or elevated slab work
Machine Mount Bracket Kit — compatible bracket for dozer and grader receiver mounting
Spectra Replacement Battery Pack — keep a spare charged for all-day operations

Related Guides

Frequently Asked Questions

Can the GL1425C-27 set independent grades on both axes at the same time?: Yes. The GL1425C supports simultaneous dual-axis grade input, allowing you to dial in separate X-axis and Y-axis slopes — up to ±10% each — in a single instrument setup. This is especially useful for parking lot cross-slopes and crowned roadway profiles where both longitudinal and transverse grades must be controlled concurrently.
What is the difference between the GL1425C-27 and the GL1425C-14 package?: The primary difference is the grade rod included in the kit. The -27 suffix designates an inch-graduated rod suited to U.S. Imperial workflows, while the -14 suffix indicates a metric-graduated rod. The laser instrument, HL760 receiver, and tripod are the same across both packages. Select -27 if your site plans and survey notes are in feet and inches.
How far away can I operate the GL1425C with the Bluetooth remote?: The RC602 Bluetooth remote control operates at ranges up to approximately 200 feet (60 m) in open conditions. This allows a single operator to adjust instrument grade settings, rotation speed, and power from the rod location without walking back to the instrument — a significant time saver on large pads and during finish grading operations.
Is the GL1425C-27 compatible with machine control receivers for grading equipment?: The GL1425C is compatible with a range of machine-mount laser receivers when used with the appropriate bracket kit. While it is not a full digital machine control system, it can effectively guide motor graders, dozers, and compactors using a mast-mounted receiver for efficient rough and finish grading without a full GPS/machine control investment.

Why This Equipment

Dual Grade Control

Control two slopes simultaneously for crowns, swales, and complex drainage layouts.

Machine Ready

Pairs with machine receivers for dozer, grader, and scraper grade control.

IP67 Rated

Weatherproof for outdoor use in rain, dust, and construction site conditions.

High Accuracy

±0.1mm/m grade accuracy — holds tolerance through a full working day.

KIT CONTENTS

What's In The Box

David White LT8-300LP Universal Level-Transit with Laser Plummet

Why Buy This?

Continuous grade control. No continuous labor.

Grade stakers cost $50–80/hr and disappear between passes. A dual-slope grade laser installs once and controls your blade automatically — through every cut, every fill, every pass. That's the math that makes grade lasers one of the fastest ROI investments in earthwork.

Professional contractors specify dual-grade systems for a reason: single-grade units work for straight drainage. The moment a job has a crown, a swale, or a complex parking lot slope — you need dual-grade.

Buying from Express Tools means authorized, factory-fresh inventory, legitimate firmware, and technical knowledge when you need it.

TECHNICAL SPECS

Specifications

Technical Specs

Manufacturer data and field-verified measurements.

Knowledge Summary	The David White LT8-300LP Universal Level-Transit features integrated laser plummet technology for precision vertical alignment without traditional plumb bobs. Designed for surveyors and contractors requiring both elevation and angle measurements, it combines optical capabilities with modern laser technology. The laser plummet enables rapid setup over survey points, benchmarks, and reference corners, significantly reducing on-site time. Ideal for establishing accurate baselines, control points, and supporting all subsequent surveying work. Civil engineers, construction layout specialists, and land surveyors rely on this instrument for projects demanding both traditional optical precision and modern laser-assisted efficiency.
Instrument Type	Universal Level-Transit with Laser Plummet
Laser Plummet	Integrated laser plummet for vertical alignment
Functions	Level, Transit, and Vertical Alignment
Model	LT8-300LP
Key Feature 1	Integrated laser plummet for vertical centering
Key Feature 2	Universal level-transit capabilities
Key Feature 3	Quick and accurate alignment over survey points
Key Feature 4	Eliminates traditional plumb bobs
Key Feature 5	Professional-grade optical system
Key Feature 6	Reduced setup time on job sites
Use Cases	Establishing baselines and control points; Property corner marking and verification; Benchmark establishment for projects; Building layout and positioning; Construction line establishment; Site boundary surveys
Setup Steps	Position tripod over benchmark or survey point \| Mount LT8-300LP securely on tripod \| Activate laser plummet by powering on instrument \| Adjust tripod position until laser spot centers on ground mark \| Use leveling screws to level instrument bubble \| Confirm vertical alignment with laser plummet \| Begin level or transit measurements as required
Pro Tips	Carry spare batteries for laser plummet system \| Use laser targeting card for improved visibility in sunlight \| Perform laser plummet calibration check at job start \| Keep laser lens clean for precise vertical alignment \| Combine laser plummet with traditional optical verification for critical points
Compatible Equipment	Standard surveying tripods; Leveling rods and targets; Laser targeting cards; David White accessories; Tripod-mounted laser shields
Common Issues	Laser plummet battery depletion during operations \| Laser spot difficult to see in bright sunlight \| Laser alignment drifting during measurements \| Optical and laser systems not synchronized
Accuracy	±1/16 in at 100 ft (1.5 mm at 30 m)
Grade Range	±10% on both X and Y axes simultaneously
Self-leveling Range	±5°
Rotation Speed	100, 300, and 600 RPM selectable
Power	Internal rechargeable battery; up to 30 hours runtime
IP Rating	Weather-resistant construction for outdoor jobsite use