A fiber visual fault locator pes VFLs for fiber optic installation, fault finding, continuity checking, polarity checking, verifying a signal path, and identifying a fiber. For single mode, multimode and plastic fibers, this is a low price fiber laser light tester  that complies with the latest visible eye safety standards for fiber laser testers.

  • Easy, compact pen-style laser checker
  • Quality drop-resistant metal & rubber body
  • Class 1 (needs no safety precautions) or Class 2M laser light 
  • 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

Part Number Details

Part Number Description + Application MSRP*
Source, Visual Fault Locator Pen 1.7 dBm, Universal 2.5mm
USD $176.10
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Source, Visual Fault Locator Pen 7 dBm, Universal 2.5mm
USD $256.90
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Not sure? Make a general enquiry.

Key Features


General Visual Fault Locator Pen KI 6300 Series specifications

For more detailed specifications, please select a specific part number from the parts & stock section.

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

In the box

Optional accessories


VFL Adaptor 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

USD $115.79

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VFL Adaptor Cord 2.5mm - 1.25mm OPT711

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

USD $33.99

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