AFL optical time domain reflectometers (OTDRs) and fault locators are used to certify new fibre installations and locate faults in deployed fibre optic networks. OTDRs and fault locators are available for both multi-mode and single-mode networks, including FTTx PONs. OTDRs scan fibre optic networks from one end of the fibre, displaying a trace and reporting detected events such as splices, connectors, micro- or macro-bends and fibre end. Fibre length is reported along with location, loss and reflectance of detected events. Several OTDRs are available with an integrated visual fault locator (VFL), optical light source (OLS), and/or optical power meter (OPM). OTDR results can be saved and uploaded to PC for further analysis and/or archiving.