A vacuum gauge is a device used to measure the pressure in a vacuum system. It helps determine how much air or gas has been removed from a sealed environment, indicating the quality of the vacuum. Common types of vacuum gauges include mechanical gauges, electronic gauges, and capacitance manometers, each suited for different pressure ranges and applications. These gauges are essential in various industries, including manufacturing, laboratories, and food packaging, where maintaining a specific vacuum level is crucial. By providing accurate readings, vacuum gauges ensure processes run efficiently and safely, preventing potential equipment failures or contamination.