Definitions:

1. A device that helps determine how much air or gas has been removed from a sealed space, providing readings that can indicate if the vacuum is reaching desired low-pressure levels. NOUN
   • A malfunctioning vacuum gauge can lead to inaccurate readings and compromised experiments.
2. A device used to measure the pressure in a vacuum system. NOUN
   • The technician used a vacuum gauge to ensure the pressure inside the chamber was sufficiently low.
3. A gauge for indicating negative atmospheric pressure. NOUN
   • The vacuum gauge's digital display provided precise readings, facilitating accurate measurements.
4. An instrument that is used to measure very low pressures of gases. NOUN
   • Before staring the process, he checked the vacuum gauge to confirm that the chamber was fully evacuated.

Synonyms:

• vacuum meter