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The Visible Fault Identifier is an essential tool that any fibre optic installer or fiber optic technician can carry in the palm of their hand. It works by shining an extremely bright 1mW Class 2 laser through any fiber optic cable, causing any and all cracks, splits or leaks to glow a brilliant bright red. The laser can also be made to flash quickly (modulate) to aid in fiber optic fault detectio..