Compound gauges read pressure in PSI and vacuum in inches of mercury.

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Multiple Choice

Compound gauges read pressure in PSI and vacuum in inches of mercury.

Explanation:
A compound gauge is built to show two kinds of pressure on one instrument: positive pressure in pounds per square inch (psi) and negative pressure (vacuum) in inches of mercury (inHg). The gauge uses a psi scale for pressure readings and a vacuum scale in inHg for vacuum readings, so you can monitor both the system’s pressure and its suction or vacuum level with the same device. This dual capability is exactly what the statement describes, making it the best answer.

A compound gauge is built to show two kinds of pressure on one instrument: positive pressure in pounds per square inch (psi) and negative pressure (vacuum) in inches of mercury (inHg). The gauge uses a psi scale for pressure readings and a vacuum scale in inHg for vacuum readings, so you can monitor both the system’s pressure and its suction or vacuum level with the same device. This dual capability is exactly what the statement describes, making it the best answer.

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