19. Is a special service tool for measuring the twisting force applied when tightening bolts and nuts - D. Torque Wrench
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For less confusion:
19.D
Explanation:
A torque wrench is a tool used to control and apply a specific torque to a fastener such as a bolt or a nut. It is a fundamental element in general mechanics, tire changing operations and industrial maintenance & repair industries, to ensure customers' safety.
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