How do you use compound gauge in refregeration?

A compound gauge is used in refrigeration systems to measure both the pressure of the refrigerant and the vacuum level within the system. It displays pressure in both vacuum (inches of Mercury) and positive pressure (pounds per square inch), allowing technicians to assess the system's performance during various stages, such as charging, troubleshooting, or maintenance. By monitoring these readings, technicians can ensure the refrigerant is at the correct pressure for optimal operation, identify leaks, and determine if the system is functioning efficiently.