Residential HVAC Installation Practice Exam

Question: 1 / 400

What is a micron gauge used to measure?

Vacuum pressure in inches of mercury

Air temperature in Celsius

Absolute pressures below 1 mm Hg

A micron gauge is a tool used to measure absolute pressures below 1 mm Hg. It is specifically designed to measure very low pressures, such as those found in HVAC systems during evacuation processes. It can accurately measure pressures in the micron range, which is crucial for ensuring that the system is free of contaminants and moisture. This makes option C the correct answer. Option A is incorrect because a micron gauge is not used to measure vacuum pressure in inches of mercury. Option B is incorrect as a micron gauge does not measure air temperature in Celsius. Option D is also incorrect as outdoor humidity levels are not measured using a micron gauge.

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Outdoor humidity levels

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