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

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

The K-C15 Visual Fault Locator is the go-to tool for fiber optic technicians who need fast, reliable cable inspection in the field. Whether you're working on FTTH installations, telecom networks, data centers, or LAN projects, this compact pen-style tester emits a bright 650nm visible red laser to quickly pinpoint break points, poor connections, excessive bends, and continuity issues across distances up to 50KM.

With its USB Type-C rechargeable battery, universal 2.5mm interface, and three operating modes, this VFL tester is ready for professional and everyday fiber maintenance tasks. Made in Mainland China.

Key Features

• 50KM Rated Test Distance: Engineered for long-distance optical fiber inspection — ideal for large-scale telecom and network projects.
• 650nm Visible Red Laser: Bright red light makes fiber faults — breaks, bends, damaged connectors — easy to spot. Output wavelength: 650nm ±10nm.
• Three Operating Modes: Simple sliding switch with CW (continuous light), GLINT (blinking light), and OFF positions for versatile fault detection.
• 2.5mm Universal Interface: Compatible with SC, FC, and ST connectors. LC connector support available with an optional adapter.
• USB Type-C Rechargeable: Built-in rechargeable battery — just plug in via USB-C to top up. No disposable batteries needed.
• Pen-Style Portable Design: Textured anti-slip grip, compact form factor — fits easily in a tool bag, pocket, or the included protective pouch.
• Protective Dust Cap: Yellow cap shields the optical interface from dust and debris when not in use.

Suitable Applications

• Fiber optic cable continuity testing
• Fiber break point 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: Remove the protective cap and plug the fiber connector into the tester's 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 After Use: Return the switch to OFF and replace the protective cap.

Product Specifications

• Model: K-C15
• Product Type: Visual Fault Locator
• 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 Compatibility: Requires optional adapter
• Charging Port: USB Type-C
• Power Supply: Built-in rechargeable battery
• Body Design: Portable pen style
• Grip: Textured anti-slip surface
• Color: Yellow

What's in the Box

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

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 more reliable results.
5. Maximum testing distance depends on fiber type, cable quality, connector loss, and environmental conditions.
6. LC connector requires a compatible adapter (not always included — check variant).

Looking for other precision testing and measurement tools? Check out our 25-in-1 Precision Magnetic Screwdriver Set for detailed repair work, or browse our 10-Pack Waterproof Cable Glands PG7/PG9 for secure cable connections in any environment.

Learn more: OSHA guidance on hand and power tools

Frequently Asked Questions

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

A: The K-C15 uses a standard 2.5mm universal interface and is directly compatible with SC, FC, and ST fiber connectors. For LC connectors, you will need an optional LC adapter. Please confirm whether the adapter is included in your selected product variant before ordering.

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

A: The K-C15 has a rated test distance of up to 50KM. Keep in mind that actual visible detection distance may vary depending on fiber loss, connector condition, ambient lighting, and the overall installation environment. It is designed to handle long-distance telecom and FTTH inspection tasks.

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

A: The K-C15 features a built-in rechargeable battery with a USB Type-C charging port. Simply connect the included USB Type-C cable to any suitable USB power source (wall adapter, power bank, laptop, etc.) to charge the device. This eliminates the need for disposable batteries, making it more convenient for field use.