FN-50D Optical Power Meter & Visual Fault Locator (VFL) – High-Precision Fiber Testing Tool

The FN-50D Optical Power Meter with Integrated Visual Fault Locator (VFL) is a professional-grade fiber optic testing instrument designed for technicians, contractors, and ISP field operations. Built for reliability and accuracy, this compact device delivers precise optical power measurements while offering a powerful VFL function to quickly identify breaks, bends, or faults in fiber cables.

Engineered for both indoor and outdoor use, the FN-50D is ideal for FTTH, maintenance, troubleshooting, and fiber deployment projects where fast and accurate diagnostics are essential.

Key Features

🔹 High-Accuracy Optical Power Measurement

Measures optical power across commonly used wavelengths with stable, repeatable results—ideal for ISP installations, OSP work, and fiber repair.

🔹 Built-In 15mW Visual Fault Locator (VFL)

The integrated red laser helps trace fiber routes and detect breaks, poor splicing, micro-bending, or connector issues.

🔹 Backlit LCD Display

Bright, high-visibility green LCD for clear readings in dark environments such as basements, attics, and outdoor enclosures.

🔹 Quick-Access Function Buttons

Dedicated controls for:

• ON/OFF
• AUTO OFF
• ZERO calibration
• Light/Backlight
• dB measurement mode
• VFL activation

🔹 Durable & Field-Ready Design

Shock-resistant casing provides extra protection for daily field use.

Technical Specifications

• Model: FN-50D
• Functions: Optical Power Meter + 15mW Visual Fault Locator
• Wavelengths Supported: 1310nm, 1490nm, 1550nm (and more depending on model)
• Measurement Range: –70 dBm to +10 dBm (varies by configuration)
• Display: High-contrast digital LCD
• Power: Battery operated
• Ideal For: FTTH, FTTB, ISP technicians, fiber contractors, fiber maintenance, and repair teams.

What’s Included

• FN-50D Optical Power Meter
• Protective rubber housing
• User manual
• Standard accessories (varies by supplier)

Why Choose This Model?

The FN-50D is known for offering excellent performance at an affordable price point, making it ideal for technicians who want professional results without paying premium brand pricing. Reliable, accurate, portable, and easy to use—perfect for any fiber toolkit.