What instrument can be used to accurately determine the pressure which a seal is breathing in or breathing out?

A manometer or water gauge is specifically designed to measure the pressure of gases or liquids in a system and can accurately reflect the pressure in a seal's breathing in or breathing out. This instrument works by comparing the pressure in the system to atmospheric pressure, allowing for precise readings that can indicate whether the pressure is increasing or decreasing.

In applications involving seals, understanding the pressure changes is critical for assessing seal integrity, leakage, or system performance. Manometers can be configured to provide readings in various units, making them versatile for different industrial settings. They are more suitable than other instruments listed for this specific purpose since a digital pressure gauge may not provide the same level of accuracy in certain conditions, a barometer measures atmospheric pressure rather than pressure changes within a seal, and a thermocouple is used for measuring temperature, not pressure. Thus, the manometer is the optimal choice for monitoring the pressure in a breathing seal.