Hobbes 257919 HandyOTDR Opti Fiber Fault Locator locates fiber faults, and displays the results on an LCD display. With its large in memory it can store up to a maximum of 300 results. In addition, the unit can save, browse, delete, and upload test data easily via USB. In addition to its capability to save, browse, delete, and upload data to a PC (via USB) easily, it also contains a large built-in memory that can store up to 300 results.