Features: Replaceable Ceramic core Design to prolong the lifetime. Test for both single-mode and multi-mode ST/SC/FC interface fiber optic cables. Red light output distance 10KM, emit a 650nm bright red light which has strong Penetrating power. It can easily and accurately detect and locate fiber breaks, poor connections, bending or cracking. It is designed with stainless steel head to prevent crash and dust. Indicating light and laser will work synchronously. Descriptions: It's Energy-saving and durable, no self-discharge phenomenon without rotating pen when the button is off. Small size and lightweight, it is portable and easy to carry. Applicable to telecommunications Engineering and Maintenance, CATV engineering and maintenance, Cabling System、Other fiber-optic project. Specifications: Central wavelength: 650nm±10nm Emitter type: LD Output power: more than 10mW Optical connector: 2.5mm universal connector CW frequency: 2Hz Power supply: 2 x AA Alkaline batteries Operating temperature: -10~+60℃ Storage temperature: -20~+70℃ Dimension: 175mm*26*26mm Material: plastic Color: black Package included: 1 x Visual Fault Locator