Publicly stated specifications
Evidence boundary: these facts come from a public product page on iguangyan.com. Fiber Tool Lab has not yet confirmed them with a sample, manual, or traceable test setup.
- Model
- GUANGYAN-SGOT04.
- Functions
- OTDR and VFL are publicly stated as integrated functions.
- Claimed test distance
- Up to 60 km.
- Claimed location resolution
- The page states meter-level fault-breakpoint location.
- Positioning
- Portable field use and long battery endurance are claimed without a published runtime figure on the reviewed page.
What a bench test must prove
- Event location error on known fiber lengths and common connector/event types.
- Dead zone, repeatability, launch-fiber requirements, and useful range under defined conditions.
- VFL output stability, connector access, heat, and control ergonomics.
- Battery runtime, charging behavior, exported results, language support, and firmware identity.
- Whether “60 km” is a maximum selectable range or a repeatable fault-location capability.
Primary public source
- iGuangyan Optical Fiber Ranger product page, accessed July 21, 2026.