Which of the following is NOT needed as a tool for performing inspections?

In the context of performing safety inspections, the essential tools are typically those that directly assist in evaluating the vehicle's safety and functionality. Among the options provided, a power drill is not necessary for the inspection process.

Tools like screwdrivers, test lights, and brake lining gauges serve specific purposes crucial to inspecting various vehicle systems. Screwdrivers are used for removing or securing panels and components; test lights are employed to check electrical systems, and brake lining gauges are specifically designed to measure the thickness of brake linings to ensure they meet safety standards.

A power drill, while useful for construction or repair work, does not directly contribute to the safety inspection of a vehicle. It typically serves purposes like fastening or drilling into materials rather than assessing vehicle safety. Therefore, it is not needed as a tool for performing inspections, making it the correct choice in this context.