FHV1A Visual Fault Finder is a 650nm Laser Source with an adjustable output power of 0dBm,3dBm,8dBm used in SM or MM fiber. Rebatteries support FHV1A work continually up to 30 hours. Grandway employs her specific design for FHV1A output port that makes output adapter truly universal compared to other products, FHV1A has an FC/SC/ST adapter . FHV1A is an ideal instrument for patchcord broken or bending, especially for fiber identification in ribbon or bunched optic fiber pigtails installation, in which identifying fiber from end to end may be troublesome or time-consuming