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The Greenlee 170XL Cable Tester and Visual Fault Locator is an indispensable tool for quickly identifying bending losses and breaks in optical fibres. If a fibre is bent too tightly, the red laser light will be seen escaping through the cable jacket. Likewise if a fibre is broken, escaping light will be visible where the break is located.
Connectors are also easily tested using the 170XL visual fault locator. A fibre broken inside or past the ferrule will cause it to glow. If the whole connector glows, it is a defective connector. If the end face polish of the connector is bad, light will be reflected internally.