Identifier, Optical Fiber The OFI 200 model Identifier is equipped with a unique two-position head design that can be configured to work with 250 µm, 900 µm, ribbon, or jacketed fiber in seconds, without tools or adjustments. When testing coated fibers, the slim design of the OFI 200 model allows easier access on a splice tray where the amount of work space is limited. The clamping trigger is ergonomically designed to fit the natural motion of the operator’s hand. A high impact molded plastic case makes the OFI 200 model suitable for use outside plant or in the central office.