Quick Answer
What is the Topcon RL-H5A?
See also: Topcon TP-L6G E-03 Laser Diode Temp Warning — Pipe Laser Fix
See also: Topcon TP-L6G E-02 Grade Sensor Fault — Pipe Laser Fix Guide
See also: Topcon TP-L6G E-01 Plumb Error — Pipe Laser Fix Guide
The Topcon RL-H5A is the most widely deployed rotary laser in US construction — a self-leveling, single-grade horizontal plane laser used for site layout, foundation work, slab pours, and rough grading.
Topcon RL-H5A — Complete Specs, Manual & Guide
Category: Rotary Laser | Brand: Topcon | Model: RL-H5A
The Topcon RL-H5A is the most widely deployed rotary laser in US construction — a self-leveling, single-grade horizontal plane laser used for site layout, foundation work, slab pours, and rough grading.
Topcon RL-H5A Full Specifications
| Accuracy | ±10 arc seconds (±1/16" per 100') |
| Self-leveling range | ±5 degrees |
| Leveling time | 3-8 seconds |
| Working range | 800m diameter with LS-80L receiver |
| Laser class / wavelength | Class 3R / 635nm red |
| Rotation speed | 150, 300, 600 RPM (selectable) |
| IP rating | IP66 (dustproof, water jet protected) |
| Drop resistance | 1 meter onto concrete |
| Battery | BT-65Q rechargeable Li-ion |
| Battery life | ~80 hours at 20°C |
| Operating temperature | -10°C to 50°C (-14°F to 122°F) |
| Weight | 2.1 kg (4.6 lbs) with battery |
| Tripod thread | 5/8" standard |
Compatible Receivers & Targets
- Topcon LS-80L — Factory-matched receiver. 360° detection, 800m range, IP66. Best choice for RL-H5A.
- Topcon LS-100D — 100mm detection window for machine control. 400m range. Works on all 635nm lasers.
- Spectra HR320 — Budget-friendly 635nm compatible receiver. 300m range. Good for backup.
- Spectra HR550 — Digital grade readout, fine-grade mode. Fully compatible with RL-H5A.
Accessories & Part Numbers
- BT-65Q — Rechargeable Li-ion battery pack (standard)
- BC-65 — Single-station battery charger
- RC-250 — Wireless remote control, 250m range
- LS-80L — 360° laser receiver, 800m range
- LS-100D — Large-window receiver for machine control
- TK-26 — Hard carry case (standard)
Error Codes Quick Reference
| E-01 | Tilt out of range — level tripod, power cycle |
| E-02 | Leveling motor fault — service required |
| E-03 | Temperature out of range — cool/warm unit |
| E-04 | Battery critically low — replace/charge |
| E-05 | Laser diode error — cool unit or service |
| E-08 | Leveling timeout — stabilize tripod setup |
| E-09 | Rotation motor fault — service required |
| E-10 | Encoder error — service required |
Frequently Asked Questions — Topcon RL-H5A
What is the Topcon RL-H5A accuracy?
The RL-H5A is accurate to ±10 arc seconds, which equals ±1/16 inch per 100 feet or ±5mm per 100 meters. This exceeds most construction project tolerances.
What receiver works with the Topcon RL-H5A?
The factory-matched receiver is the Topcon LS-80L. Any 635nm red laser receiver from other brands (Spectra HR320, HR550) also works. Pipe laser receivers and IR receivers are not compatible.
How long does the Topcon RL-H5A battery last?
Approximately 80 hours at 20°C (68°F) with the BT-65Q battery. Expect 40-50 hours in cold conditions below 0°C. Always start with a full charge in cold weather.
Can the Topcon RL-H5A do dual-grade work?
No — the RL-H5A is a single horizontal plane laser. For dual-grade (X and Y slope simultaneously), you need the Topcon RL-SV2S.
What is the RL-H5A working range?
800-meter working diameter (400m radius) with the LS-80L or compatible receiver. Without a receiver, visible range is approximately 50-70 meters outdoors.
How do I fix E-01 on the Topcon RL-H5A?
E-01 means tilt out of range. Power off, manually level the tripod head with the built-in bubble until centered, then power on again. See our full guide: How to Set Up the Topcon RL-H5A.
Track your RL-H5A calibration dates, service history, and field verification records with Gradelog's Equipment Registry. Free to start at gradelog.com.
