The VIAVI STOTDR‑PRO‑IM‑APC (also known as FSTOTDR‑PRO‑IM‑APC) is a powerful handheld triple-wavelength SmartOTDR tester with 1310/1550 nm plus filtered 1650 nm support, ideal for metro and access networks, featuring a 5″ outdoor touchscreen, integrated power meter, VFL, and full PON diagnostics.