Final answer:
A manometer is a sampling device used for sampling pressurized systems under flow conditions. It measures fluid velocities and can be used as air speed indicators.
Step-by-step explanation:
One sampling device used for sampling pressurized systems under flow conditions is a manometer. A manometer uses the property that pressure due to the weight of a fluid of constant density is given by p = hpg. Manometers are often used to measure various fluid velocities and can be used as air speed indicators in aircraft.