Topcon RL-H5B DB2 Rotary Laser — Complete Inches Kit for Professional Contractors
The Topcon RL-H5B DB2 is a self-leveling rotary laser built for contractors who demand accuracy, range, and reliability on demanding jobsites. Packaged as a complete field-ready kit (SKU: 1021200-33-K2), this system pairs the RL-H5B laser with the LS-80L digital receiver, an inches-graduated grade rod, and a heavy-duty aluminum tripod — everything you need to establish grade, check elevations, and control earthwork the moment you arrive on site. Designed for grading, excavation, concrete flatwork, site layout, and drainage work, this kit is engineered to eliminate the field conversion errors and measurement mismatches that cost contractors time and money on grade-sensitive applications.
Jobsite Overview
The RL-H5B DB2 delivers a consistent 360-degree laser plane across an operating range of up to 600 meters in diameter with receiver assistance. Its dual-grade capability allows the laser head to be tilted on both the X and Y axes simultaneously — a critical feature for contractors managing sloped pads, drainage swales, parking lots with cross-slopes, and road sub-base work. The automatic self-leveling system compensates for minor tripod settlement, and the out-of-level alarm halts the beam automatically when the instrument is disturbed beyond its leveling range, preventing costly errors from propagating across the site. The LS-80L receiver's large numeric display and audible guidance signals make rod readings fast and unambiguous at extended distances even in bright daylight conditions. Because the kit is graduated in inches, it matches directly with US-standard site plans and finish elevation callouts — no mental conversion, no calculator, no rework risk.
Key Specifications
- Model: Topcon RL-H5B DB2
- Operating Range (with receiver): Up to 600 m diameter (2,000 ft)
- Accuracy: ±1.5 mm at 30 m (±1/16 in at 100 ft)
- Self-Leveling Range: ±5 degrees automatic
- Grade Range (Dual Axis): ±10% on both X and Y axes simultaneously
- Rotation Speed: 300, 600, or 1,200 RPM selectable
- Laser Class: Class 3R, 635 nm visible red beam
- Power Source: 4x D-cell alkaline batteries
- Battery Life: Approximately 100 hours at 600 RPM
- IP Rating: IP66 — dust-tight and water-jet resistant
- Operating Temperature: -20°C to +50°C (-4°F to +122°F)
- Receiver: Topcon LS-80L with 600 m detection range
- Grade Rod: Inches-graduated, suitable for standard US site documentation
- Tripod: Heavy-duty aluminum construction with adjustable leg locks
What's in the Kit
- Topcon RL-H5B DB2 self-leveling dual-grade rotary laser
- Topcon LS-80L digital laser receiver with rod clamp and remote control
- Inches-graduated grade rod (standard US measurement)
- Heavy-duty aluminum tripod with adjustable legs
- Carrying case for laser head and receiver
- 4x D-cell batteries (initial supply)
- Operator's manual and warranty documentation
Job Applications
Grading and Earthwork
Set the RL-H5B on a stable tripod at a central hub, dial in your design grade on the dual-axis head, and control cut and fill across the entire pad from a single instrument setup. The 600 m range means one setup covers most residential and light commercial grading projects without moving the instrument.
Concrete Flatwork and Slab Pours
Establish screed rail elevations, check form heights, and verify finished slab elevations using the LS-80L receiver and inches rod. The ±1.5 mm accuracy at 30 m exceeds ACI tolerances for standard slabs, and the inches graduation matches the dimension callouts on structural drawings directly.
Drainage and Utility Trenching
Use the dual-grade function to establish a consistent cross-slope or longitudinal grade in drainage channels, swales, and utility corridors. Audible guidance on the LS-80L lets operators work efficiently without a second crew member reading the rod, reducing labor cost on trenching operations.
Site Layout and Rough Infrastructure
Check subgrade elevations before base course placement, verify parking lot sub-base grades, and control road crown and superelevation on private site roads. The RL-H5B's IP66 protection rating keeps the instrument operational in rain, dust, and muddy site conditions without interrupting the schedule.
Compatible Accessories
- Topcon LS-80L Replacement Receiver
- Topcon RC-Series Wireless Remote Control
- Aluminum Grade Rods — Inches and Metric
- Heavy-Duty Aluminum and Fiberglass Tripods
- Laser Detector Rod Clamps and Brackets
- Topcon Replacement Carrying Cases
Related Guides
- How to Set Grade with a Rotary Laser Level
- Setting Up a Dual-Grade Laser for Sloped Pads and Drainage
- Rotary Laser vs. Pipe Laser — Choosing the Right Tool
- Topcon RL-H5B Field Calibration and Care Guide
Frequently Asked Questions
- What makes the DB2 version of the RL-H5B different from the standard model?
- The DB2 designation indicates dual-grade (dual-axis) capability. The RL-H5B DB2 allows you to tilt the laser plane on both the X and Y axes simultaneously, enabling you to establish a compound slope — for example, a parking lot with both a longitudinal grade and a cross-slope — from a single instrument setup without manual shimming or additional calculation.
- Can the LS-80L receiver be used with other brand lasers?
- The LS-80L is optimized for use with Topcon laser transmitters. While it may detect the beam from some competing lasers operating at 635 nm, full functionality, numeric display accuracy, and remote control integration are only guaranteed when paired with compatible Topcon instruments like the RL-H5B.
- Why does this kit use an inches rod instead of metric?
- In the United States, the majority of residential, commercial, and civil site plans document elevations and grades in feet and inches. Using an inches-graduated rod eliminates the need to convert metric readings to match plan callouts in the field — reducing errors, speeding up verification checks, and keeping rod readings directly comparable to the elevation notes your superintendent or inspector is working from.
- Is the Topcon RL-H5B suitable for use in rain or dusty conditions?
- Yes. The RL-H5B carries an IP66 protection rating, meaning it is dust-tight and protected against powerful water jets. It can continue operating in rain and heavy dust environments that would sideline less-protected instruments. However, like all precision optical instruments, it should be stored in its case when not in use and should not be submerged in water.
