The opening decides the tool. A camera goes where nothing else will because the probe is only as wide as the hole, and probes here run 3.9mm, 5.5mm and 8.5mm. A mirror needs enough room for the head to turn once it is in, and heads run 30mm up to a 200mm underbody mirror.
Shaft type decides whether the tool can be aimed after it goes in. A fixed shaft holds its angle and pushes straight. A flexible shaft bends round an obstruction and stays where it is put. A telescopic shaft extends to reach, and an articulated head turns at the end of it. Articulated heads matter most at the far end of a long reach, where the tool is already committed to its route.
Reach is the third figure and it is easy to underestimate. The fixed shaft mirror runs 370mm and the flexible 470mm, which is the difference between seeing behind an engine and only seeing the front of it. Telescopic bodies extend beyond both. Reading the reach figure against the depth of the cavity before buying avoids a tool that stops short of the thing being inspected.
Underbody mirrors are a different proposition again, using a large 200mm adjustable head to view a wide area of a vehicle from a low position rather than probing into a cavity. A four piece telescopic pick-up tool and mirror set covers seeing and retrieving in one purchase. Questions go over WhatsApp on 07754288583 with the access. Mirror head sizes here run 30mm and 40mm on the telescopic bodies and 60mm on the flexible shaft.
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