What is another name for the suction/low side gauge on a manifold gauge set?

The suction or low side gauge on a manifold gauge set is also known as a compound gauge. This type of gauge is specifically designed to measure pressures below atmospheric pressure, as well as positive pressures. The term "compound" refers to its ability to measure both vacuum (negative pressure) and pressure (positive pressure) in the refrigerant system.

In HVAC applications, the compound gauge plays a critical role in diagnostics and service. It allows technicians to read the low side pressure of a refrigeration or air conditioning system, providing essential information for assessing the operating condition of the system, identifying potential issues, and making necessary adjustments.

The other options do not accurately describe the function of the low side gauge. A static gauge refers to gauges that read pressures without dynamic flow conditions (not the case for a manifold gauge), a pressure gauge typically does not include the ability to measure negative pressures, and a temperature gauge is specifically designed to measure temperatures rather than pressures. Therefore, "compound gauge" is the correct terminology for the suction/low side gauge in manifold gauge sets.