AFL Noyes OFL250B SM 1310 1550 Fiber Flex Tester & Power Meter DVD Recorder Manhole & Utility Box Covers Type Size:Storage Door 18 1 2" Manhole & Utility Box Covers This digital delay unit offers extraordinary flexibility for increasing intelligibility in acoustically large environments Standard features include: 1310 1550 nm or 1550 nm only OTDR with 26 dB dynamic range Integrated Optical Power Meter (OPM) with Wave ID Integrated Optical Light Source (OLS) with Wave ID Integrated Visual Fault Locator (VFL) The AFL OFL250 is a single mode OTDR ideal for fault locating and basic testing of single mode fibers in metro and access networks