What is used to verify a torque wrench calibration?

• A. Temperature check
• B. Visual inspection
• C. Weight and level arm tester
• D. Battery check

Answer: (C)

Verifying torque wrench calibration is about confirming the wrench delivers the exact torque it’s set to by applying a known, reproducible torque and comparing the reading to that known value. A weight and level arm tester is ideal because it creates a precise torque through a simple physics relationship: torque equals force (the weight) times distance (the lever arm). By placing a calibrated weight at a specified distance from the fulcrum, you generate a known torque, and you can see whether the wrench indicates that same value. This method provides a direct, quantitative check of the wrench’s output against a traceable standard, across the range it’s used.

Temperature checks, visual inspections, and battery checks don’t verify the actual torque the wrench applies. Temperature considerations matter for performance, but they don’t confirm reading accuracy. Visual inspection can catch damage or wear, but won’t confirm calibration. Battery status matters for electronic wrenches, but calibration requires an applied torque measurement, not power level.