Which of the following statements is true concerning the gauge labeled "A" of the illustrated gauge manifold set? GS-RA-01

Correct Answer: Option A — The gauge labeled "A" is a compound gauge and is usually color-coded blue.

Standard refrigeration manifold gauges designate the low-side suction/compound gauge with a blue bezel and face. This compound gauge measures both positive pressures and negative vacuum pressures (in inches of mercury) to monitor evaporator saturation parameters.