After installing a new fiber optic link, a network technician notices a decrease in signal strength which appears to be causing intermittent connectivity issues. The link was tested post-installation and showed acceptable levels of light transmission. Suspecting a contamination issue at the connectors, which tool should the technician use to inspect the connectors for dirt and debris?
Fusion splicer
Fiber light meter
Fiber optic inspection scope
OTDR (Optical Time Domain Reflectometer)