The Optical Fiber Identifier instrument uses macro bending technology to carry out nondestructive test on the line，Signal direction and approximate power can be detected at any position of SM/MM fibers. Avoid line interruption caused by misoperation. Macrobending measurement：The weak optical signal is exposed when the optical fiber is bent，The direction and intensity of the optical signal are detected by judging the direction and intensity of the leakage. No damage to optical fiber and no interruption of com munication，It can directly detect 0.25mm bare optical fiber, 0.9mm tight sleeve optical fiber and 3mm jumper. VFL：The recognizer can be equipped with 2mW VFL to find the fault point of 10km (laboratory value) line. OPM: It can be equipp with 8 standard wave power meters, used to test the optical power value of the measured optical fiber. Low battery monitoring：When the battery is low, yellow or red prompt will be sent to remind the user to replace the battery to avoid interruption of use.