How does a technician adjust a mechanical gauge on a refrigerant manifold test set if it is out of tolerance?
A) Tighten the adjustment screws until the needle points to 100.
B) Adjust the needle to the 0 psi point or to the point of a known pressure source.
C) Replace the gauge, because it is not possible to calibrate it.
D) Gauge an unknown pressure and use the needle to find that pressure.
B
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