A compound gauge measures both pressure and ________.

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Multiple Choice

A compound gauge measures both pressure and ________.

Explanation:
A compound gauge is designed to read both positive pressure and negative pressure (vacuum) relative to atmospheric pressure. That dual capability matters in HVAC work because systems can be charged with refrigerant (positive pressure) or evacuated to a vacuum before charging. The gauge shows pressure on the positive side (psig) and vacuum on the negative side (inHg or similar units), allowing you to monitor either condition with one instrument. It doesn’t measure temperature, humidity, or altitude, which require different instruments such as a thermometer, hygrometer, or barometer/altimeter.

A compound gauge is designed to read both positive pressure and negative pressure (vacuum) relative to atmospheric pressure. That dual capability matters in HVAC work because systems can be charged with refrigerant (positive pressure) or evacuated to a vacuum before charging. The gauge shows pressure on the positive side (psig) and vacuum on the negative side (inHg or similar units), allowing you to monitor either condition with one instrument. It doesn’t measure temperature, humidity, or altitude, which require different instruments such as a thermometer, hygrometer, or barometer/altimeter.

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