Visual Fault Locator K-V30

A 50 g aluminum pen that makes the fault glow: five output powers from 5 mW to 50 mW at 650 nm, one button for CW and blink, and a 2.5 mm universal end that takes SC, FC and ST straight in.

Five powers, one pen: 5 mW for short patch cords and pigtails inside the cabinet, the mid powers as all-round field versions, and 30 to 50 mW for longer runs where the beam has further to travel before it can leak out at the fault — same body, same universal connector, the power is set when you order
One button does everything: a short press turns the pen on in CW for a steady glow while you trace a cord, the next press switches to blink — a flashing fault is far easier to pick out of a crowded frame than a steady light — and the next press turns it off; no menus, no setup
Universal 2.5 mm connector takes FC, SC and ST ferrules directly, so the pen walks from the ODF to the floor box to the customer's ONT without swapping adapters; LC work goes through an FC-to-LC adapter, available separately
The wear parts come off by hand: the 2.5 mm metal head and the 7 mm ceramic ferrule inside it are user-replaceable, so a worn or chipped ferrule is swapped in the field instead of retiring the whole pen — the ferrule is a wear part and sits outside the warranty, and we say so up front
Aluminum alloy body in silver, black or blue — non-slip in the hand, corrosion-resistant, and at 50 g light enough to live in a shirt pocket or the test slot of a tool kit; the dust caps come in a range of colors and can be made in your brand color
Checked before it ships: the switch is tested for 100,000 presses, and every finished pen passes a fiber break test after assembly before it is packed — the unit that arrives has already found a fault on the bench
Runs on two AA batteries — cells you can buy anywhere in the world and swap in seconds, with no charger to carry and no built-in pack to age out

5 mW10 mW20 mW30 mW50 mW

Ask for Pricing WhatsApp K-V30 Datasheet (PDF)

Checked before it ships

Functions verified against the ordered version before dispatch — the version table on this page is the exact build list.

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Your brand on it

Neutral instrument branding as standard; labeling per order.

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Stock & small lots

Instruments are supplied to the version you order; tell us the work and we will help you spec it.

Specifications

K-V30 full specification

Output power	Five versions — 5 / 10 / 20 / 30 / 50 mW, set when you order
Wavelength	650 nm (visible red)
Modes	CW continuous and blink (pulse) from one button — short press steps on / blink / off
Connector	Universal 2.5 mm — FC, SC and ST plug straight in; LC via FC-to-LC adapter (sold separately)
Head and ferrule	2.5 mm metal head and 7 mm ceramic ferrule, both user-replaceable; the ferrule is a wear part and is not covered by warranty
Body	Aluminum alloy, non-slip and corrosion-resistant — silver, black or blue
Dust caps	Multiple colors; custom colors made to order
Button life	Tested for 100,000 presses
Power supply	2 × AA batteries
Operating temperature	-10 °C to +60 °C
Storage temperature	-20 °C to +70 °C
Weight	50 g
Dimensions	165 × 26 mm

One K-V30 visual fault locator (power version as ordered)Cloth pouchWrist strap2 × AA batteries

In the box: the parts above, packed per unit. Applications: Finding breaks, crushed sections and over-tight bends in patch cords and pigtails · Checking continuity before a splice or before a jumper goes into service · Identifying one fiber in a bundle by its glow at the far end · Locating faulty connectors in cabinets, closures and distribution frames · Working the OTDR dead zone: the first metres an OTDR cannot see, the VFL can.

How a visual fault locator finds the fault

The pen injects bright visible red light — 650 nm — into the fiber. Where the fiber is intact, the light stays inside the core and travels on. Where the glass is broken, sharply bent or badly joined, part of that light escapes through the side of the fiber, and because patch-cord jackets and buffer tubes are translucent, the escape shows as a glowing red spot at exactly the place that needs attention.

Two output modes cover the two jobs. CW gives a steady beam for continuity checks and for following one cord through a frame. Blink pulses the light, and a pulsing glow stands out from every steady reflection around it — in a crowded cabinet, the blinking fiber is yours. One button steps through on, blink and off, so the pen works one-handed, gloves on.

The locator is the OTDR's partner, not its rival. An OTDR measures the link and distances the event, but its dead zone hides the first metres past the connector, and it cannot tell you which pigtail in a tray is the broken one. Thirty seconds with the pen answers both — and it is the fastest sanity check there is before a splice: light in, glow at the far end, continuity proven.

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