Automation System
An aneroid barometer

None of these
can measure only atmospheric pressure
can be used to measure gas or liquid flow rates
measures pressure by sensing deflection of an evacuated chambers.
is very unreliable

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Automation System
Stepping motors:

can run at varying speeds
All of these
can be built to index different amounts by changing the pole configuration
do not require commutators
can run both clockwise and counterclockwise

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