Residential HVAC Installation Practice Exam

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What is a micron gauge used to measure?

  1. Vacuum pressure in inches of mercury

  2. Air temperature in Celsius

  3. Absolute pressures below 1 mm Hg

  4. Outdoor humidity levels

The correct answer is: 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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