Topcon RL-H5A-BCA / 1021200-50-BCA

The Topcon RL-H5A (1021200-50-BCA) is a professional-grade self-leveling rotary laser built for contractors who demand reliable performance across large jobsites. Whether you're grading a commercial pad, setting slope on a drainage project, or establishing elevation for concrete flatwork, the RL-H5A delivers consistent accuracy in a rugged, field-ready package. This alkaline battery configuration ships with the laser transmitter and a protective hard-shell carrying case, giving you a complete ready-to-deploy unit that integrates seamlessly with your existing receivers and grade rods.

Product Overview

Engineered for high-volume earthwork and civil construction, the RL-H5A operates across a full 360-degree horizontal plane with an impressive 300-meter working radius. Its automatic self-leveling mechanism compensates for minor tripod displacement, keeping your reference plane accurate without constant manual adjustment. The IP66-rated housing handles rain, dust, and the everyday abuse of a working jobsite. Slope mode functionality lets you dial in single-axis grade—critical for drainage swales, road subgrades, and utility corridors where precise fall is required.

Key Specifications

• Model: Topcon RL-H5A
• Part Number: 1021200-50-BCA
• Operating Range: Up to 300 meters (radius) with compatible receiver
• Accuracy: ±1/8 inch at 100 feet (±3mm at 30m)
• Self-Leveling Range: ±5 degrees automatic compensation
• Rotation Speed: 600 RPM
• Grade/Slope Range: ±5% on single axis
• Power Source: Alkaline batteries (included)
• Battery Life: Approximately 100 hours (alkaline)
• Protection Rating: IP66 dust and water resistant
• Operating Temperature: -20°C to +50°C (-4°F to 122°F)
• Laser Class: Class 3R, 635nm visible red beam

What's in the Kit

• Topcon RL-H5A rotary laser transmitter
• Protective hard-shell carrying case
• Alkaline battery set
• Note: Laser receiver and grade rod are sold separately

Job Applications

Site Grading and Earthwork: The 300-meter operating radius makes the RL-H5A ideal for large commercial grading projects. Set up once at the center of the site and maintain a continuous reference elevation across the entire pad without repositioning.

Concrete Flatwork and Slab Placement: Use the RL-H5A with a compatible laser receiver to strike accurate screeding heights and verify slab elevation before and after pours. The ±1/8" accuracy keeps floors within spec on commercial and industrial slabs.

Drainage and Utility Trenching: Single-axis slope mode lets operators dial in precise grade percentages for storm drain lines, sanitary sewer runs, and irrigation mains—reducing re-work and inspection failures.

Road and Parking Lot Subgrade: Establish consistent subgrade elevations across long highway or parking lot sections. The robust IP66 housing ensures the unit keeps performing through wet and dusty site conditions common to road base work.

Compatible Accessories

• Topcon LS-80L Laser Receiver — Extended-range detector for outdoor use
• Topcon LS-80X Laser Receiver — Universal receiver with wide detection window
• Topcon LR-1 Remote Control — Wireless grade and speed adjustment from the machine
• Aluminum Laser Grade Rod — Direct-reading rod with receiver bracket
• Heavy-Duty Laser Tripod — Stable base for extended setup time
• NiMH Rechargeable Battery Pack — Longer runtime alternative to alkaline

Related Guides

• How to Set Up a Rotary Laser on a Construction Site
• Rotary Laser vs. Pipe Laser: Which Do You Need?
• Setting Single-Axis Slope with the Topcon RL-H5A
• Choosing the Right Laser Receiver for Outdoor Grading

Frequently Asked Questions

Does the RL-H5A (1021200-50-BCA) include a laser receiver?

No. This alkaline battery package includes only the RL-H5A laser transmitter and carrying case. A compatible receiver such as the Topcon LS-80L or LS-80X must be purchased separately to detect the beam at distance in outdoor conditions.

What is the difference between the alkaline and NiMH versions of the RL-H5A?

The alkaline package (1021200-50-BCA) uses standard alkaline batteries, which are widely available and deliver approximately 100 hours of runtime. The NiMH version uses a rechargeable battery pack for lower long-term operating cost. The laser performance and specifications are identical between both configurations.

Can the RL-H5A be used for slope and grade work?

Yes. The RL-H5A includes single-axis slope mode with a range of ±5%. This allows you to tilt the laser plane to a specific grade percentage, making it suitable for drainage channels, road subgrades, and utility trenching where a constant fall is required.

What is the self-leveling range of the RL-H5A?

The RL-H5A automatically self-levels within a ±5 degree range. If the tripod or surface shifts beyond that threshold, the unit will emit an out-of-level alert and stop rotating to prevent inaccurate readings. Always set up on stable, level ground and verify level before beginning work.