Features: EASY AND ACCURATE IDENTIFICATIONIt can easily and accurately detect and locate fiber breaks, bad connections, bends or cracks. The tester emits a 650nm bright light for fiber detection, breaks or faults in the fiber will break the light. PRACTICAL DESIGN AND EXCELLENT FUNCTIONSmall size and light weight, it is portable and easy for field test with multiple functions such as constant power output, low battery warning, long battery life and long-distance detection. WIDELY USEDThe tester's 2.5mm universal connector is compatible for ST, SC, FC interferes in both circle and square shape of various fiber optic cables. Test for both single-mode and multi-mode cables. LONG OUTPUT DISTANCEThis 30mW visual fault tester with battery output strong red light goes 20-30 kilometers far, high effective circuits enable stable performance. PORTABLEPen-type design with pocket make it portable, easy to check fiber faults with visual fault finder, durable, dust-proof design keep fiber connector clean. Specification: Optical output power: >30mW. Exit Distance: 30KM. Output wavelength: 650nm. Fiber Optic Adapter: Universal connector. Use temperature: 0~60. Storage stability: -20~70. Battery type: 5 alkaline batteries(not included). Size: 175 x 26 x 26mm. Product weight: 173g. Package included: 1 x Visual Fault Locator(Not included battery). 1 x Carry bag. 1 x Neck Strap