Visual Fault Locator K-V30

• 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

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.

• One K-V30 visual fault locator (power version as ordered)
• Cloth pouch
• Wrist strap
• 2 × AA batteries