NOYES OFI-400HP Optical Fiber Identifiers are designed to detect and measure 1 the core power levels of optical signals on single-mode optical fiber without disconnecting or cutting the fiber. These instruments are simply clamped onto a fiber and indicate the presence and direction of traffic, continuous test signals and modulated test tones. This permits network personnel to easily and quickly identify a specific fiber without risk of revenue service disruption. The OLS7, OLS2, CSS1-SM and CSS1-MM series of optical light sources are ideal companions for the OFI-400 optical fiber identifiers. No Adapters to Purchase, Store, Swap, or Misplace the OFI-400 uses a unique optical head design featuring a two-position plunger that enables it to be used with 250?m, 900?m and ribbon fiber or 2mm and 3mm jacketed fiber. Other brands of optical fiber identifiers require users to purchase, store and swap out optical plungers each time a different type of fiber is tested. The OFI-400 optical head induces a safe, repeatable macro-bend to the fiber that allows a small amount of light to escape for analysis. The insertion loss induced by the macro-bend is too small to affect the signal on the fiber and the integrity of the fiber is unaffected by the measurement process. OFI-400 instruments are designed to be simple, easy- to-use and reliable. Each features an ergonomically designed macro-bend trigger that is comfortable to use. An integrated, backlit LCD display allows OFI-400s to be used in dimly lit spaces. Powered by 1.5V AAA batteries, the OFI-400 can make thousands of fiber tests before replacing batteries.