Torque wrench calibration got me twice in Colorado, analog vs digital study

Had two jobs fail last spring at a regional outfit near Denver. Both times the digital unit read fine on the test rig. But the old analog beam style caught a loose fitting that the digital missed on a 737 flap actuator. Same torque spec, same day. Digital said 120 inch pounds. Analog showed 118 and a half. That half pound was the difference. Now I keep both in my box. Anyone else run dual wrenches for critical stuff?

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