10mW Aluminium Alloy Red Light Visual Fault Locator Fiber Optic Cable Tester10KM/VFL For FC,SC,ST & LC Adapter Made of high quality aluminum material.Portable, durable and rugged, easy to use, 2.5mm & 1.25mm for SC,ST,FC and LC Connectors Strong light source, strong Penetrating power, stable property. And have two mode: always light and flicker. Constant output power, lower Battery warning, Long battery life (up to 60 hours) It is resent from slipping, comfort grab feel, carefully modified. Crash-proof and dust-proof design for its head Easy to change the ceramic core. It will help to extend the use of time.