Which tool is commonly used to measure refrigerant pressure?

The manifold gauge set is the correct choice for measuring refrigerant pressure in HVAC systems. This tool typically consists of two pressure gauges—one for measuring the high side pressure and one for measuring the low side pressure, along with a set of hoses to connect to the refrigerant system. By using this tool, HVAC technicians can accurately assess the pressures in the system, ensuring it operates efficiently and diagnosing any issues that may arise.

A thermometer is primarily used to measure temperature, and while it is important in HVAC, it does not measure pressure. A pressure gauge, while also a correct type of instrument, is broader and does not provide the dual measurements that a manifold gauge set offers—it is generally used for simpler applications or in situations where only single pressure readings are needed. A vacuum pump is essential for evacuating the system but is not used for measuring refrigerant pressure. Thus, the manifold gauge set is specifically designed for this purpose, making it the most suitable tool for measuring refrigerant pressure.