Which tool is commonly used to check the backlash between old gears during inspection?
Feeler gauge
Backlash is the small clearance between the mating teeth of two gears, and inspecting it means measuring a narrow gap.
A feeler gauge carries thin blades of known thickness that slide into such gaps, so it directly reads the clearance between gear teeth.
A torque wrench sets tightening torque, a file removes metal, and a hammer strikes, so none of them measure a gap.
Hence, the answer is Feeler gauge.
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