红光源（可见光源） 

红光源采用 650nm 激光器，可输出大于 1mW 、 8mW 、 10mW 的高亮度红色激光。有多种外形、多种测量距离、多种供电方式可供用户。可输出连续光及 1HZ 、 2Hz 的调制光。可方便地用于单模和多模光纤的测试。

Visual Fault Locator is used for the measurement of single-mode fiber or multi-mode fiber. It feature rugged size, universal connector. Visual Fault Locator easily identifies the cutting, micro-bending of the optic fiber, passes through the jacket fiber ａnd realized the end to end fiber identification. Its measurement range is up to 5Km 、 10Km 、 15Km . It is an ideal tool for the examination of all kinds of patch cords ａnd ribbon or bunched pigtails in installation ａnd maintenance of fiber optic networks