XHT-M03 · FIELD TEST INSTRUMENTS
Visual Fault Locator
Red-light VFL and 1550 nm IVFL for locating breaks, bends, bad splices and dirty connectors.
3 models · pen-style / rechargeable mini / VFL+IVFL combo · 650 nm red or 510 nm green · MOQ 1
A 650 nm VFL injects visible red light so faults glow at the fiber end. Models A and B are everyday VFLs for short-distance visual checks; Model C adds a 1550 nm invisible VFL (IVFL) with a color waveform trace for long-distance and in-service PON location. All models use a 2.5 mm universal interface (SC/ST/FC), with an optional 1.25 mm adapter (LC/MU).
Model Lineup
Connect the locator to the fiber; a break, bend, poor splice or contaminated connector leaks light at the fault point. Specifications below are stated per model.
Visible VFL XHT-M03-A & XHT-M03-B
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Pen-style visual fault locator XHT-M03-A
Alloy pen, AA cells, wide power range from 5 to 100 mW.
Best-fit: everyday FTTH turn-up and maintenance, jumper and patch panel inspection, pocket carry with no charging; higher-power options (30–100 mW) cover long jumpers and high-split networks.
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| Type | Pen-style VFL |
| Wavelength | 650 nm red laser |
| Output power | 5/10/15/20/30/50/60/70/80/100 mW |
| Mode | CW / flashing |
| Optical interface | 2.5 mm universal (SC/ST/FC); optional 1.25 mm adapter (LC/MU) |
| Power supply | 2×AA (1.5 V) cells |
| Housing | High-grade alloy, simple pen |
| Dimensions | 26 mm (W) × 26 mm (D) × 175 mm (H) |
| MOQ | 1 pc |
| Reference lead time | 3 days |
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Rechargeable mini visual fault locator XHT-M03-B
Rechargeable Li-ion, built-in LED, red or green laser, key-ring body.
Best-fit: confined cabinets and night work, key-ring carry; the 510 nm green laser gives higher visibility for training and special-fiber work; no disposable batteries.
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| Type | Rechargeable mini VFL |
| Wavelength | 650 nm red / 510 nm green |
| Output power | Red 15/30/50/80/100 mW; green 15/30 mW |
| Mode | CW / flashing |
| Optical interface | 2.5 mm universal (SC/ST/FC); optional 1.25 mm adapter (LC/MU) |
| LED light | Built-in |
| Power supply | Rechargeable Li-ion |
| Housing | Compact, key-ring |
| Dimensions | 35.5 mm (W) × 18 mm (D) × 123.5 mm (H) |
| MOQ | 1 pc |
| Reference lead time | 3 days |
VFL + IVFL Combo XHT-M03-C
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VFL + 1550 nm IVFL combo XHT-M03-C
2.0 in color screen with waveform trace, up to 20 km, in-service PON location.
Best-fit: acceptance and hand-over, long-distance/backbone faults up to 20 km, and in-service PON location with a waveform trace; VFL + 1550 nm IVFL in one tool.
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| Type | VFL + IVFL combo |
| VFL | 650±20 nm, CW / 3 Hz |
| IVFL wavelength | 1550±10 nm |
| IVFL range | 100 m / 500 m / 1 km / 2.5 km / 5 km / 10 km / 20 km |
| Live (pass-through) testing | 1270/1310/1577 ≤7 dBm; 1490 ≤0 dBm |
| Display | 2.0 in color screen with waveform trace |
| VFL optical interface | 2.5 mm universal (SC/ST/FC); optional 1.25 mm adapter (LC/MU) |
| IVFL optical interface | SC/PC |
| LED light | Built-in |
| Power supply | 800 mAh Li-ion, Type-C |
| Battery life | VFL >4 h; IVFL >6 h |
| Dimensions | 49 mm (W) × 25 mm (D) × 158 mm (H) |
| Weight | 119 g |
| Operating conditions | 0–50 °C; 10–90% RH non-condensing |
| MOQ | 1 pc |
| Reference lead time | 3 days |
FAQ
Q1. What is the difference between VFL and IVFL? A VFL uses 650 nm visible red light for short-distance visual checks (the fault glows at the fiber end). The IVFL uses 1550 nm invisible light, shown on Model C's screen as a waveform, for long-distance faults up to 20 km and in-service PON testing.
Q2. Which output power should I choose? 5–10 mW covers indoor and short FTTH links; 30–50 mW suits longer jumpers and split networks; 80–100 mW is for the longest reach and highest loss. Model B's green 510 nm laser gives higher visibility for training and special-fiber work.
Q3. Which connectors does it fit? All models accept a 2.5 mm universal interface for SC/ST/FC; a 1.25 mm adapter is available for LC/MU. On Model C, the IVFL port is SC/PC.
Ordering
• Part number: XHT-M03-[A/B/C] — A pen-style, B rechargeable mini, C VFL+IVFL combo.
• MOQ 1. Reference lead time 3 days. Other output powers, the 1.25 mm adapter (LC/MU) and bulk orders are arranged on request; confirm the wavelength and power before ordering.
• Orders are checked against the confirmed model, wavelength and power before packing; response within 24 h.
To recommend the correct locator: tell us the distance to locate, the fiber and connector type, and whether the network is live (in-service PON). Model C is required for long-distance and in-service location.
Related Products
• Optical power meter (absolute power and loss) → XHT-M01
• Live XGS-PON power meter (1270/1577) → XHT-M02
• Optical light source (paired with a meter for loss) → XHT-M04
• Fiber optic test master kit → XHT-M08
• One-click fiber connector cleaner → XHT-T07
