Visual Fault Locator and Red Light Pen 10mW Fiber Optic Cable Tester
The 10mW Visual Fault Locator, commonly called a red light pen, helps technicians trace optical fibers and investigate visible continuity problems.
It injects visible light into a disconnected fiber. Light escaping at an accessible damaged section, connector area, or tight bend can help narrow down a fault. It is useful during patch-cord checks, fiber identification, and installation troubleshooting.
Key Specification
Feature
Specification or Purchase Check
Product type
Visual fault locator
Listed optical output
10mW
Test method
Visible-light continuity and fault tracing
Connector interface
Confirm supplied fitting and adapters
Operating modes
Confirm continuous and flashing modes
Power source
Confirm battery type or charging arrangement
Wavelength
Confirm manufacturer specification
Test distance
Depends on the supplied model and link conditions
Optical loss measurement
Not provided by a basic VFL
Fault-distance measurement
Requires suitable distance-measuring equipment
A VFL helps identify fibers and continuity problems; optical loss and fault distance require different measurement tools. Fluke Networks
Features and Benefits
Identify a fiber: Help trace the correct strand between accessible termination points.
Check continuity: Investigate whether visible test light reaches the expected end.
Inspect accessible problem areas: Look for leakage around damaged patch cords or severe bends.
Support installation work: Use alongside a power meter, inspection equipment, or OTDR.
