??Practical Design & Excellent Function?Portable VFL Pen:Small size lightweight type is easy to field test. Crash-proof & Dust-proof: Metal pen body With low battery detection indicator,This Visual Fault Locator Can Operates Either In CW Or Pulsed Mode,Fiber optic vfl lighting 2Hz glint or continuous output. ??Accurate Identification?Easily and accurately detect locate fiber breaks,poor connections,bending or cracking, 30mW Visual Fault Locator will emit a 650nm bright light for fiber tracing,breaks or faults in the fiber will refract the light. Fiber Routing and Continuity Checking Efficiently,Creating A Bright Glow Around The Faulty Area. ??30KM Detection Distance & Durable?Strong Light Source & Strong Penetration:30mW Output Power easily penetrate 30KM of optical fiber,Continuous Wave and Pulsed Mode, constant output power. Design with Stainless Steel Head and Aluminium Body to prevent crash and dust,the case ground design prevents ESD damage efficiently. ??Wide Application?Universal 2.5mm connector designed for LC,ST,SC,FC interferes both in circle and square shape of different fiber optic cables,test for both single-mode and multi-mode cables. Apply To: Integrated wiring systems and Fiber Optic engineering;CATV Engineering optic network Maintenance;Optical Telecommunications;Optical Measurement drive engineering, optical device production and research. ??100% Money Guarantee? HOKICHEN proudly guarantees the quality, performance and fit of the 30mw VFL. If you are not completely satisfied with your FXWSKY purchase, simply return the item within 60 days of purchase for a refund.