Which tool is required for conducting inspections?

The correct answer is a brake lining gauge, which is an essential tool used during vehicle inspections to assess the thickness of the brake linings. This measurement is crucial for determining whether the brake system is functioning safely and effectively. Ensuring that the brake linings are within the acceptable thickness range is vital for vehicle safety, as worn-out brake linings can lead to decreased braking performance and increased stopping distances.

A hammer, while useful in various contexts, is not specifically required for evaluating key components of a vehicle's safety systems during an inspection. Similarly, a wrench set, although necessary for various mechanical repairs and adjustments, is not directly involved in the assessment of critical safety metrics like brake lining wear. A magnifying glass might assist in inspecting small components or details but does not serve the same purpose or provide the necessary measurements that a brake lining gauge does.

In summary, the brake lining gauge is uniquely designed to perform vital safety assessments within the context of vehicle inspections, making it the correct choice for this question.