POWER SUPPLY: The optical fiber test pen built in 600 mAh large-capacity lithium battery, it has 8 hours long theoretical standby time, short charging time EASY TO CARRY: This test pen is equipped with a lanyard, making the test pan more convenient to carry OPTICAL FIBER DETECTING: The optical fiber tester has easy identification of fiber break, indicate the signal directions and power in fiber,displays the relative core power and indicate the signal or absence STRONG PENETRATING POWER: This visual fault locator will emit a 650mm bright red light which has strong penetrating power and with output distance 15KM STABLE POWER: High effective power circuits allow for stable lighting power, operates in bothcontinuous wave and pulse mode Description The optical fiber tester owns 2.5mm universal connector, compatible for FC, ST, SC and more connectors; test for both singlemode and multimode interface fiber optic cables. This visual fault locator will emit a 650mm bright red light which has strong penetrating power, specially designed for tracing,fiber routing and continuity checking. Features Fiber optic tester -Color: Black. -Material: ABS. -Size: 12.5x3.5x1.7 cm/4.92x1.38x0.67 inch. Output Wavelength: 650mm Interface Type: 2.5mm / 0.1in universal adapter Working Temperature: -20--60 Storage Temperature: -40--85 Working Hours: 10h Output Power: >10mW No need to plug and replace the battery, reducing battery and circuit plugging loss. Replaceable ceramic core design to prolong the lifetime. Package Including 1 * Fiber optic tester 1 * Lanyard 1 * Charger 1 * Ceramic core replacment