Do the experienced forum members know this?
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The medium is lubricating oil; it should be a type of sight glass with scales. What is its exact name? Is it a gauge or a fitting?
Why is it so similar to a rotameter?:$
Yeah, it even has markers indicating the direction of rotation.
Flow indicator, used to determine whether the medium is flowing in the pipeline； No output, no scales, no precision requirements :)
Flow indicator? Looking at the explanation, it’s just a sight glass – used to check whether there is material flowing inside. .