K-C15 50KM Visual Fault Locator | 650nm Fiber Optic Tester Pen

K-C15 Visual Fault Locator Pen – 50KM Fiber Optic Cable Tester

The K-C15 Visual Fault Locator is a professional-grade, pen-style fiber optic tester designed for technicians and engineers who need fast, reliable identification of faults in optical fiber cables. Using a bright 650nm visible red laser, this compact tool lets you pinpoint break points, bending faults, damaged connectors, and continuity issues across distances rated up to 50KM.

With its USB Type-C rechargeable built-in battery, 2.5mm universal interface, and dual working modes, this VFL pen is ideal for FTTH installations, telecom maintenance, data centers, LAN projects, and patch panel troubleshooting.

Made in Mainland China.

Key Features

• 50KM Rated Test Distance: Engineered for long-distance optical fiber inspection. Actual visible range varies based on fiber loss, connector condition, and ambient light.
• 650nm Visible Red Laser: Clearly illuminates fiber break points, bends, connector damage, and continuity faults. Output wavelength: 650nm ±10nm.
• Three Working Modes: Slide switch with CW (continuous light), GLINT (blinking light), and OFF positions for versatile fault identification.
• 2.5mm Universal Interface: Compatible with SC, FC, and ST connectors. LC connector compatibility requires an optional adapter.
• USB Type-C Rechargeable: Built-in rechargeable battery — no disposable batteries needed. Charges via any standard USB power source.
• Pen-Style Portable Design: Textured anti-slip grip for comfortable handling. Compact enough to carry in a pocket, tool bag, or protective pouch.
• Protective Dust Cap: Yellow cap guards the optical interface from dust and debris when not in use.

Suitable Applications

• Fiber optic cable continuity testing
• Fiber break point and fault detection
• Optical connector inspection
• FTTH installation and maintenance
• Telecom network maintenance
• Data center fiber inspection
• LAN and optical communication projects
• Patch panel troubleshooting
• Fiber bending and leakage inspection

How to Use

1. Connect the Fiber: Open the protective cap and plug the fiber connector into the 2.5mm interface.
2. Select Working Mode: Slide the switch to CW for continuous light or GLINT for blinking light.
3. Locate the Fault: Observe the fiber cable — visible red light leaking from the cable indicates a break, bend, crack, or poor connection.
4. Switch Off: Return the switch to OFF and replace the protective cap after use.

Product Specifications

• Model: K-C15
• Rated Test Distance: Up to 50KM
• Output Wavelength: 650nm ±10nm
• Working Modes: CW / OFF / GLINT
• Interface: 2.5mm universal
• Compatible Connectors: SC / FC / ST (LC requires optional adapter)
• Charging Port: USB Type-C
• Power Supply: Built-in rechargeable battery
• Body Design: Portable pen-style with textured anti-slip grip

Package Includes

• 1 × Visual Fault Locator Pen (K-C15)
• 1 × USB Type-C Charging Cable
• 1 × Wrist Strap
• 1 × Protective Carrying Pouch

Package contents may vary slightly depending on the selected option. Please verify the product variation before purchase.

Important Safety Notes

1. Do not look directly into the laser output.
2. Do not point the laser toward people or animals.
3. Keep the protective cap closed when the tester is not in use.
4. Clean the fiber connector before testing for reliable results.
5. Maximum test distance depends on fiber type, cable quality, connector loss, and environment.
6. LC connector requires a compatible adapter (not included).

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Frequently Asked Questions

Q: What fiber connectors are compatible with the K-C15 Visual Fault Locator?

A: The K-C15 features a standard 2.5mm universal interface that is directly compatible with SC, FC, and ST fiber connectors. LC connectors can also be used but require a separate compatible LC adapter, which is not included in the standard package.

Q: How far can the K-C15 Visual Fault Locator detect fiber faults?

A: The K-C15 is rated for a maximum test distance of up to 50KM. However, the actual visible detection range will vary depending on factors such as fiber type, cable quality, connector loss, and ambient lighting conditions in the work environment.

Q: How do I charge the K-C15 Visual Fault Locator Pen?

A: The K-C15 features a USB Type-C charging port. Simply connect the included USB Type-C charging cable to any standard USB power source (such as a laptop, wall adapter, or power bank) to recharge the built-in battery — no disposable batteries required.

Q: What is the difference between CW and GLINT modes on the K-C15?

A: CW (Continuous Wave) mode emits a steady, uninterrupted red laser beam, which is ideal for straightforward continuity testing and connector inspection. GLINT mode produces a blinking red light, which makes it easier to spot subtle faults, bending points, or light leakage in varying work environments.