6.5Mm Borescope Explained: A UK Buyer's Guide
By Daniel Z.2026-06-221 min read
TL;DR: A 6.5mm borescope is the optimal inspection camera diameter for automotive diagnostics in the UK. It perfectly balances access and functionality, fitting easily through standard 8mm and 10mm diesel glow plug ports while remaining large enough to house high-definition dual lenses, powerful LED lighting, and robust articulating mechanics.
If you are wondering what size inspection camera you need, a 6.5mm borescope is specifically designed to diagnose internal engine faults without stripping the block
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