Which tool is used to measure refrigerant levels in an A/C system?

The tool used to measure refrigerant levels in an A/C system is the refrigerant gauge set. This tool consists of high-pressure and low-pressure gauges that allow technicians to assess the pressure of the refrigerant in the system. By measuring these pressures, a technician can determine if the refrigerant levels are within the manufacturer's specified range. Proper refrigerant levels are crucial for the efficient operation of an A/C system, affecting both performance and energy consumption.

Thermometers measure temperature, which is not directly related to refrigerant levels. A voltmeter is used to measure electrical voltage, which is also unrelated to refrigerant measurements. A pressure washer is not relevant in this context, as it is designed for cleaning purposes, not for assessing refrigerant in an A/C system. Thus, the refrigerant gauge set is specifically designed for monitoring and measuring refrigerant levels accurately.