What is the main difference between a pressure gauge and a compound gauge?

The main distinction lies in the functionality of the gauges. A pressure gauge is specifically designed to measure the pressure of gases or liquids in a system and does not provide information about vacuum levels. In contrast, a compound gauge can measure both pressure and vacuum, allowing it to read negative pressure values as well. This versatility makes the compound gauge particularly valuable in applications where both pressure and vacuum conditions need to be monitored, as it serves a broader range of functions than a standard pressure gauge. This capability is critical in various industrial settings, ensuring accurate monitoring of systems that may operate under different pressure conditions.