Quick Answer
What is the Topcon TP-L6G?
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 TP-L6G is the industry-standard green beam pipe laser for precision sewer, drain, and force main installation. The green 532nm beam provides significantly better visibility than red beam pipe lasers in the ambient light conditions of open trenches and manholes.
Topcon TP-L6G — Complete Specs, Manual & Guide
Category: Pipe Laser | Brand: Topcon | Model: TP-L6G
The Topcon TP-L6G is the industry-standard green beam pipe laser for precision sewer, drain, and force main installation. The green 532nm beam provides significantly better visibility than red beam pipe lasers in the ambient light conditions of open trenches and manholes.
Topcon TP-L6G Full Specifications
| Accuracy | ±8 arc seconds (±0.01% grade per 100') |
| Grade range | 0% to ±10% |
| Grade setting resolution | 0.001% |
| Laser class / wavelength | Class 3R / 532nm green |
| Working range | 300m (980') with TP-MT1 remote target |
| Self-plumbing range | ±5 degrees |
| IP rating | IP67 |
| Battery | Rechargeable Li-ion pack |
| Battery life | ~30 hours |
| Operating temperature | -10°C to 40°C |
| Remote target | TP-MT1 wireless |
| Communication range | 100m wireless link |
Compatible Receivers & Targets
- TP-MT1 — Topcon wireless remote target — required for automatic grade adjustment. 5-inch detection window, wireless link up to 100m.
- TP-L target (manual) — Non-wireless target for manual setup. No automatic grade adjustment.
Accessories & Part Numbers
- TP-MT1 — Wireless remote target
- TP-60 — Tripod/cradle for manhole setup
- Carry case — IP67-rated waterproof case
Error Codes Quick Reference
| E-01 | Plumb out of range — level cradle cross-level |
| E-02 | Grade sensor fault — service required |
| E-04 | Battery low — replace/charge |
| E-05 | Target communication lost — check target power and distance |
| E-10 | Remote target not found — power on target before laser |
Frequently Asked Questions — Topcon TP-L6G
What is the accuracy of the Topcon TP-L6G?
±8 arc seconds, equal to approximately 0.01% grade error per 100 feet. This is more precise than most sewer and drainage project requirements.
Why green laser on the TP-L6G instead of red?
Green laser (532nm) is approximately 4x more visible to the human eye than red (635nm). In the ambient light conditions of open trenches and manholes, the green beam is significantly easier to detect at working distances.
What is the maximum grade the TP-L6G can set?
±10% in either direction — covering all practical sewer, drain, and force main grades. Most gravity sewer work is under 2%; the 10% maximum accommodates steep terrain installations.
How do I pair the TP-MT1 target to the TP-L6G?
Power on the TP-MT1 target first, then power on the TP-L6G. The laser searches for an active target on its communication channel at startup. If E-10 appears, confirm the target is powered on and within initial link range (30 feet).
Can the TP-L6G work in flooded conditions?
The TP-L6G is IP67 rated (temporary immersion up to 1 meter). It can handle a manhole with standing water at setup height, but the unit should not be submerged during operation.
Document pipe run grades, as-built invert elevations, and inspection records for TP-L6G jobs with Gradelog. Free to start.
