The Spectra GL1425C-17 is a field-ready dual-slope grading package engineered for contractors who need precise, repeatable grade control from the moment they arrive on site. By combining the GL1425C dual-slope laser transmitter, HL760 rod-mounted receiver, heavy-duty elevator tripod, and a tenths-graduated grade rod into a single matched kit, Spectra eliminates compatibility guesswork and streamlines procurement. Whether you are cutting drainage swales, paving parking lots, or shaping embankments, this package delivers the accuracy and speed that professional grading crews demand.
System Overview & Jobsite Applications
The GL1425C transmitter broadcasts a dual-axis grade plane across the entire jobsite, allowing a single instrument setup to control both primary and cross-slope simultaneously. Bluetooth connectivity lets the grade operator adjust slope settings remotely via the Spectra Precision Layout app, reducing instrument walk-backs and keeping the crew productive. The HL760 receiver mounts directly to the grade rod and provides both audible and visual grade indication, so machine operators and rod persons can work confidently in direct sunlight or low-light conditions. The tenths-graduated rod face resolves elevation differences to 0.1 foot, which is the standard tolerance for commercial site drainage, ADA-compliant parking lot slopes, and highway embankment construction.
Key Specifications
- Model: GL1425C-17 Package
- Transmitter: Spectra GL1425C Dual-Slope Laser
- Grade Range: ±10% on both axes simultaneously
- Accuracy: ±1.5 arc-second (±0.5 mm at 30 m)
- Working Radius: Up to 300 m (985 ft) diameter
- Receiver: Spectra HL760 with 165 mm (6.5 in) detection window
- Connectivity: Bluetooth wireless remote grade control
- Power: Rechargeable NiMH battery pack; up to 50-hour run time
- Protection: IP66 dust and water resistant transmitter
- Rod Graduation: Tenths (0.1 ft) for drainage and paving applications
What's in the Kit
- GL1425C dual-slope rotating laser transmitter
- HL760 rod-mounted laser receiver with grade indicator
- Elevator tripod for fast, stable instrument setup on uneven terrain
- Tenths-graduated grade rod for 0.1 ft resolution layout
- Rechargeable battery pack and AC charger
- Carry case for transmitter and accessories
- Operator's manual and quick-start guide
Job Applications
Commercial Parking Lot Paving: Set dual-axis cross-slope and longitudinal grade simultaneously to meet ADA drainage requirements across large paved surfaces without repositioning the instrument.
Site Drainage & Swale Grading: Use the tenths rod to hit 0.1 ft grade breaks precisely, ensuring positive drainage flow to inlets and away from structures.
Embankment & Subgrade Work: Control cut and fill operations over wide areas with the 300 m working radius, keeping dozers and motor graders on grade without constant survey checks.
Foundation Pad & Slab Prep: Establish a flat or sloped reference plane for concrete flatwork, reducing finishing time and material waste on slabs-on-grade and industrial floors.
Compatible Accessories
- Spectra HL760 Replacement Receiver
- Spectra RC602 Bluetooth Remote Control
- Spectra GL1425C Rechargeable Battery Pack
- Heavy-Duty Aluminum Grade Rod (Tenths)
- Machine Mount Bracket for HL760
- Spectra Precision Layout Mobile App
Related Guides
- How to Set Dual Slope with the GL1425C
- Reading a Tenths Grade Rod: Field Reference
- GL1425C vs GL422N: Choosing the Right Grade Laser
- Bluetooth Remote Setup for Spectra Grade Lasers
Frequently Asked Questions
- Can the GL1425C-17 control both X and Y slopes at the same time?
- Yes. The GL1425C transmitter supports simultaneous dual-axis grade control, allowing you to set independent slopes on both the primary and cross-slope axes without repositioning. This is essential for parking lot paving and complex drainage grading where two-plane slope control is required in a single instrument setup.
- Does the HL760 receiver work with other Spectra or Trimble lasers?
- The HL760 is compatible with all Spectra Precision and Trimble rotating grade lasers operating at 635 nm wavelength, including the GL422N, GL512, and similar models. It features a 165 mm detection window and provides both audible beeps and a multi-segment LED display for on-grade indication in bright outdoor conditions.
- What does "tenths" graduation mean and when do I need it?
- A tenths-graduated rod is marked in increments of 0.1 foot rather than the 1/8-inch divisions found on engineer's rods. Tenths rods are standard for civil site work, drainage design, and roadway construction where grade sheets and plan elevations are expressed in decimal feet. If your project plans specify grades in feet and tenths, this rod eliminates mental conversion in the field.
- Is Bluetooth remote control included in the GL1425C-17 package?
- The GL1425C transmitter is Bluetooth-enabled and compatible with the Spectra Precision Layout app for remote grade adjustment from a smartphone or tablet. A dedicated RC602 handheld remote is available separately if you prefer a physical controller. Check the package contents list or contact Express Tools to confirm which accessories ship with your specific kit configuration.
