[High efficiency]Easy identification of fiber breakpoints, poor connecttions, bending or cracking. Excellent for finding the right fiber to splice or quickly finding a break. Our 30mW Visual Fault Locator Emit a 650nm Bright Red Light For Fiber Tracing, Fiber Routing And Continuity Checking Efficiently, Breaks Or Faults In The Fiber Will Refract The Light, Creating A Bright Glow Around The Faulty Area. [Excellent Functions]The fiber optic tester is perfect for field tests because of its multiple functions such as constant output power, multi-interface adaptation, low battery warning, long battery life, and long-distance detection. Super bright and uses convenient AA battery. [Widely USed]2.5mm Universal Connector - the connector of the detector is compatibly designed for ST, SC, FC interferes both in circle and square shape of different fiber optic cables. [Long Output Distance]The 30mW visual fault locator has a strong output power, can output a strong red indicating light, up to 20-30 kilometers. The high-efficiency power supply circuit ensures a stable power supply. [Crash-proof and Dust-proof Design for Pen Head]It Is Designed With Stainless Steel Head And Aluminium Body To Prevent Crash And Dust, And The Case Ground Design Prevents ESD Damage Efficiently. Colour: black + blue Material: metal Package Contents: 1 x 30mW fiber optic pen (powered by 2*AA batteries without batteries) 1 x FC male to LC female adapter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.