The Inspectron 3.8mm Diameter HD Forward View Imager is the smallest imager head in the range, at 3.8mm diameter, with a forward-facing camera in HD resolution for inspecting straight down very narrow bores or channels.
Choosing forward view over side view depends on the inspection angle needed; having both available means a workshop can pick the right head for the specific fault being checked.
See the full range of automotive diagnostic tools from Ally Diagnostics.