EXFO EUI-98 is an interchangeable LC connector adapter (EXFO Universal Interface) used on EXFO test instruments. It adapts LC ferrule connectors for source/power-meter/light-source ports on EXFO OTDRs and light sources. EXFO documentation uses the EUI-98 code to denote LC adapters; manufacturer spec sheets map EI-EUI-98 to UPC/LC and EA-EUI-98 to APC/LC. Public product detail and images are provided by EXFO distributors (example listings shown).