A fiber visual fault locator pen VFL for fiber optic installation, fault finding, continuity checking, polarity checking, verifying a signal path, and identifying a fiber. For use on single mode, multimode and plastic fibers, this is a low price 1mW fiber laser light tester that complies with the latest visible eye safety standards for fiber laser testers. A perfect addition to any OTDR fiber tester to find very short-range faults, and faults within the OTDR dead-zone.

  • Easy, compact pen-style laser checker
  • Quality drop-resistant metal & rubber body
  • Class 1 laser light pen needs no safety precautions
  • 2.5 mm universal connector & translucent captive cap
  • Will not turn on by mistake, or roll off a bench
  • Continuous or pulsed operation
  • The smallest laser pen tracer with 2 x AAA batteries
  • Also available in convenient Test Kits
  • 3 year warranty

MPO-Specific Continuity, Polarity & End Face Tester

More VFL & cable fault finders


Key Features


KI6358 specifications
Typical output power with PC-polish connector SM = 0.7 mW or -1.3 dBm --- 50 µm MM = 1.3 mW or 1.0 dBm
Laser protection class, coupled / uncoupled Class 1, IEC60825-2: 2021
Country of Origin Germany
Shipping Weight 100 g
General Visual Fault Locator Pen KI 6300 Series specifications
Wavelength 655 ± 5 nm
Output mode CW or 2~3 Hz modulation
Battery 2 x AAA (LR-03) Alkaline
Battery life > 40 hours
Connector 2.5 mm universal
Retention force for ferrule 1 ~ 2 N
Size 18 mm x 160 mm
Unit weight 83 g (including batteries)
Shipping weight 0.1 kg
Operating / storage temperature -10 to +45 °C / -40 to +70 °C
Relative humidity 95%
Warranty 3 years

Documentation & Support


This product is included in the following test kits
Recommended for these applications

In the box

Protective Case for VFL

Convenient small case to protect VFL from dust and dirt during transit

Instrument User Manual

Comprehensive user manual, in well written English

Optional accessories


VFL Adapter 2.5mm Male to 1.25mm Female OPT189

Adapts VFL pen with 2.5 mm connector, for use with LC / other 1.25mm ferrule connectors


VFL Adapter Cord 2.5mm - 1.25mm OPT711

Adapts VFL pen with 2.5 mm connector, for use with LC connectors


Fiber Connector Cleaner Cartridge TOOL CLEAN-09A

To clean a connector end face / tip, prior to connector insertion into a mating adaptor.


Stick-Type Cleaner 2.5 mm TOOL CLEAN-03

To clean the end face and mating sleeve of a fiber optic connector with 2.5 mm diameter ferrule. SC, FC, ST etc.


Stick-type Cleaner 1.25 mm TOOL CLEAN-04

To clean the end face and mating sleeve of a fiber optic connector with 1.25 mm diameter ferrule, LC, SN etc

© Kingfisher International, Australia, ABN 51 007 250 213