Quick Answer
What is the Topcon RL-H4C?
See also: Topcon Rotary Laser E-01 Error — Tilt Out of Range Fix
See also: Topcon Rotary Laser E-03 Error — Temperature Warning Fix
See also: Topcon Rotary Laser E-05 Error — Laser Diode Fix
The Topcon RL-H4C is a self-leveling horizontal rotary laser designed for general construction grading, foundations, and interior leveling. It operates with the LS-80A receiver over a 800-meter working diameter.
Topcon RL-H4C — Complete Specs, Manual & Guide
Category: Rotary Laser | Brand: Topcon | Model: RL-H4C
The Topcon RL-H4C is a professional-grade self-leveling horizontal plane rotary laser suited for foundation work, slab pours, and site grading. It pairs with the Topcon LS-80A or LS-80L receiver and offers IP66 weather resistance for all-day outdoor use.
Topcon RL-H4C Full Specifications
| Accuracy | ±10 arc seconds (±1/16" per 100') |
| Self-leveling range | ±5 degrees |
| Leveling time | 4-8 seconds |
| Working range | 800m diameter with LS-80A receiver |
| Laser class / wavelength | Class 3R / 635nm red |
| Rotation speed | 150, 300, 600 RPM (selectable) |
| IP rating | IP66 |
| Battery | BT-52QA rechargeable Li-ion |
| Battery life | ~75 hours at 20°C |
| Operating temperature | -10°C to 50°C |
| Weight | 2.0 kg (4.4 lbs) with battery |
| Tripod thread | 5/8" standard |
Compatible Receivers
- Topcon LS-80A — Factory-matched receiver. 360-degree detection, 800m range, IP66.
- Topcon LS-80L — Upgraded model with fine-grade digital readout.
- Spectra HR320 — Budget-compatible 635nm receiver. 300m range.
- Spectra HR550 — Digital grade readout. Fully compatible with RL-H4C.
Accessories & Part Numbers
- BT-52QA — Rechargeable Li-ion battery pack
- BC-27C — Single-station battery charger
- RC-250 — Wireless remote control, 250m range
- LS-80A — 360-degree laser receiver, 800m range
- LS-80L — Upgraded receiver with fine-grade mode
- TK-26 — Hard carry case
Error Codes Quick Reference
| E-01 | Tilt out of range — manually level tripod and power cycle |
| E-02 | Leveling motor fault — service required |
| E-03 | Temperature out of range — cool or warm unit before use |
| E-04 | Battery critically low — replace or charge immediately |
| E-05 | Laser diode error — cool unit, then power cycle |
| E-08 | Leveling timeout — stabilize tripod and retry |
| E-09 | Rotation motor fault — service required |
Frequently Asked Questions — Topcon RL-H4C
What is the Topcon RL-H4C accuracy?
The RL-H4C is accurate to ±10 arc seconds, equal to ±1/16 inch per 100 feet or ±5mm per 100 meters. This level of accuracy meets the demands of most construction grading and foundation projects.
What receiver works with the Topcon RL-H4C?
The factory-matched receiver is the Topcon LS-80A. The LS-80L is an upgrade option with fine-grade mode. Any 635nm red laser receiver from Spectra Precision (HR320, HR550) also works.
How long does the RL-H4C battery last?
Approximately 75 hours at 20°C with the BT-52QA battery. Cold weather below 0°C reduces runtime to approximately 35-40 hours. Carry a spare battery for full-day cold-weather operations.
What is the difference between the Topcon RL-H4C and RL-H5A?
The RL-H5A is the next-generation successor to the RL-H4C. The H5A offers an extended battery life of 80 hours vs 75, improved shock resistance, and is compatible with newer RC-400 remote controls. Both share the same laser accuracy and working range.
Can the RL-H4C do grade work?
No — the RL-H4C is a horizontal-only laser. It does not have grade capability. For grade work, you need the Topcon RL-SV2S (dual-grade) or a dedicated grade laser such as the RL-H4CG.
Related models: Topcon RL-H5A | Topcon RL-SV2S
Track your RL-H4C calibration dates, service history, and field verification records with Gradelog's Equipment Registry. Free to start at gradelog.com.
