Accommodates two dual-wavelength optical plug-in modules such as the FM8513 (wavelengths 850/1300nm) at the same time offering dual-wavelength multimode and dual-wavelength single mode optical cable testing at the push of a button. Allows testing of virtually any communications network, Telco, CATV, or LAN without switching modules. Measurements include event loss, event distance, two-point distance, two point loss, fiber attenuation, event return loss (reflectance and link return loss (ORL). High-resolution color display system. Long-range performance; MS-DOS file compatible; 1dB to 50dB vertical display range, 1m to 200km distance display range, GPIB and RS-232 interfaces.