Residential HVAC Installation 2025 – 400 Free Practice Questions to Pass the Exam

A compound gauge measures both pressure and temperature. In HVAC systems, a compound gauge is commonly used to measure the pressure of refrigerant in the system. It consists of two gauges in one unit - a low-pressure side (measures pressure in the low-pressure part of the system) and a high-pressure side (measures pressure in the high-pressure part of the system). Temperature can also be measured using this type of gauge, providing versatility and efficiency for technicians during HVAC system installations or servicing. Therefore, the correct answer is D, as a compound gauge is designed to measure both pressure and temperature.